US7406337B2 - Wireless communication system and method using multiple antennas - Google Patents
Wireless communication system and method using multiple antennas Download PDFInfo
- Publication number
- US7406337B2 US7406337B2 US10/778,340 US77834004A US7406337B2 US 7406337 B2 US7406337 B2 US 7406337B2 US 77834004 A US77834004 A US 77834004A US 7406337 B2 US7406337 B2 US 7406337B2
- Authority
- US
- United States
- Prior art keywords
- weight
- indexes
- peak
- transmission
- sinrs
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active, expires
Links
- 238000000034 method Methods 0.000 title claims abstract description 71
- 238000004891 communication Methods 0.000 title claims abstract description 41
- 230000005540 biological transmission Effects 0.000 claims abstract description 112
- 239000013598 vector Substances 0.000 claims abstract description 106
- 230000008569 process Effects 0.000 claims abstract description 20
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims abstract description 19
- 238000012545 processing Methods 0.000 claims description 33
- 238000001228 spectrum Methods 0.000 claims description 29
- 230000008054 signal transmission Effects 0.000 claims description 24
- 230000007480 spreading Effects 0.000 claims description 21
- 230000001934 delay Effects 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 10
- 238000005562 fading Methods 0.000 description 8
- 238000004364 calculation method Methods 0.000 description 4
- 230000008520 organization Effects 0.000 description 4
- 238000007670 refining Methods 0.000 description 4
- 230000004044 response Effects 0.000 description 3
- 230000003044 adaptive effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 230000000750 progressive effect Effects 0.000 description 2
- 238000013139 quantization Methods 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0636—Feedback format
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/0634—Antenna weights or vector/matrix coefficients
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/26—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service]
- H04W52/262—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service] taking into account adaptive modulation and coding [AMC] scheme
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/38—TPC being performed in particular situations
- H04W52/42—TPC being performed in particular situations in systems with time, space, frequency or polarisation diversity
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0452—Multi-user MIMO systems
Definitions
- the present invention relates to a wireless communication system and method using multiple antennas. More particularly, the present invention relates to a wireless communication system and method using multiple antennas, by which a transmission throughput can be maximized in a multi-user environment employing a high-speed downlink packet access (HSDPA).
- HSDPA high-speed downlink packet access
- next-generation wireless communication systems transmit data at a higher rate.
- 3GPP 3rd Generation Partnership Project
- HSDPA High Speed Downlink Packet Access
- 3GPP2 3rd Generation Partnership Project2
- 1xEvolution Data Only/Voice (1xEV-DO/V) technique 3rd Generation Partnership Project 2
- the two standard organizations have suggested HSDPA to smoothly provide Internet services including web services.
- the HSDPA technique is optimized to a peak throughput as well as an average throughput, thereby accomplishing smooth transmission of packets, such as data, as well as circuit transmission, such as voice communication.
- an Adaptive Modulation and Coding (AMC) technique To implement the HSDPA technique, an Adaptive Modulation and Coding (AMC) technique, a Hybrid Automatic Repeat reQuest (HARQ) technique, and a multi-user diversity scheduling technique are fundamentally needed. Furthermore, to overcome a limit of a given bandwidth, an efficient multiple antenna technique is required.
- AMC Adaptive Modulation and Coding
- HARQ Hybrid Automatic Repeat reQuest
- multi-user diversity scheduling technique are fundamentally needed.
- an efficient multiple antenna technique is required.
- a diversity order indicating a degree of diversity gain corresponds to a number of users requesting packets simultaneously.
- the multiple antenna technique overcoming the limit of a bandwidth uses a geometric space axis when it is used by way of beam-forming, and therefore, the limit of resources of bandwidth in a frequency axis can be overcome.
- a nulling technique is used. Beam-forming is a process that performs nulling using a correlation between antennas which are close to each other, for example, separated from each other by a distance of ⁇ /2 (where ⁇ is a wavelength).
- w 1 and w 2 denote matrices expressing weights, respectively, h 1 and h 2 denote channels, n 1 and n 2 denote noises mixed with the respective reception signals r 1 and r 2 , and H indicates a Hermitian matrix.
- the following description concerns a multiple antenna technique in diversity mode.
- wireless communication systems are configured so that multiple mobile stations communicate with one another through a single base station.
- loss according to a characteristic of a wireless communication channel, such as fading, and interference for each user need to be minimized. Fading may reduce the amplitude of a reception signal by several dB through several tens of dB.
- a variety of diversity techniques may be used.
- CDMA Code Division Multiple Access
- the rake receiver employs a reception diversity technique for receiving multipath signals.
- a diversity technique has a problem in that it does not operation when a delay spread is small.
- Space diversity is largely divided into space diversity and time diversity.
- Space diversity uses multiple antennas.
- Time diversity uses interference and coding and is usually used for a Doppler spread channel.
- space diversity is used to overcome fading in an indoor channel having a small delay spread and in a pedestrian channel, which is a low-speed Doppler channel.
- Space diversity uses two or more antennas so that when a signal received through one antenna is attenuated due to fading, the signal can be received through another antenna.
- Space diversity is divided into transmission diversity and reception diversity according to an employed antenna type. It is difficult to install reception antennal diversity in a mobile station in terms of installation area and cost, and therefore, it is recommended to use transmission antenna diversity in a base station.
- Transmission antenna diversity is divided into closed loop transmission diversity, in which a base station receives downlink channel information fed back from a mobile station, and open loop transmission diversity, in which there is no feedback from a mobile station to a base station.
- a mobile station measures the phase and amplitude of a channel and finds an optimal weight.
- a base station sends different pilot signals through respective antennas to measure the amplitude and phase of a channel.
- the mobile station measures the amplitude and phase of the channel using a pilot signal and finds an optimal weight based on the measured amplitude and phase of the channel.
- TxAA mode 1 and TxAA mode 2 are closed loop transmission diversity using two antennas.
- TxAA mode 1 and TxAA mode 2 were standardized by 3GPP, which is an International Mobile Telecommunications (IMT-2000) standardization organization led by Europe and Japan, and distributed as version Release (R) 99.
- TxAA mode 1 suggested by Nokia, feeds back only a phase difference between two antennas.
- TxAA mode 2 suggested by Motorola, feeds back the phases and gains of two antennas.
- TxAA mode 1 and mode 2 are disclosed in a specification defined by 3GPP, which is the standardization organization for Universal Mobile Telecommunications System (UMTS), which is the standard of European IMT-2000.
- UMTS Universal Mobile Telecommunications System
- TxAA mode 1 and mode 2 are designed such that a mobile station sends weight information to a base station, and the base station obtains channel information from the weight information.
- a phase accuracy is ⁇ /2, and a maximum quantization error is ⁇ /4.
- refining is performed by updating one of two bits in each feedback.
- two bits can be combined like ⁇ b(2k), b(2k ⁇ 1) ⁇ and ⁇ b(2k), b(2k+1) ⁇ .
- “b” is a bit that is fed back in each slot
- 2k, 2k ⁇ 1, and 2k+1 denote a feedback sequence of bits.
- TxAA mode 2 both phase and gain that constitute weight information are fed back.
- a phase is fed back in three bits, and a gain is fed back in one bit.
- a phase accuracy is ⁇ /4
- a maximum quantization error is ⁇ /8.
- progressive refining is performed by updating one among four bits in each feedback. In a refining method, each bit becomes values of an orthogonal basis. However, in a progressive refining method, such a rule is not defined.
- the nulling technique can be applied only to a beam-forming method in which a distance between antennas is limited to a predetermined value. Therefore, it is difficult to use the nulling technique for multiple diversity antennas far apart from each other. Accordingly, multiple diversity antenna systems for voice transmission are structured to omit the nulling technique. In other words, when a distance between antennas increases, a correlation between the antennas decreases. As a result, a channel change period is in inverse proportion to a maximum Doppler frequency. In an existing voice communication environment, a channel used by a user during a single frame duration is not fixed but varies, and therefore, it is impossible to apply nulling to a fixed channel.
- the number of antennas becomes far more than the number of simultaneous users and then exceeds the degree of freedom in nulling multiple antennas, i.e., (the number of antennas ⁇ 1). Accordingly, it is difficult to apply the nulling technique to a conventional diversity method using multiple antennas.
- a wireless communication system including multiple transmission/reception antennas, which is compatible with TxAA mode 1 and mode 2 and which can overcome a frame size problem and a problem related to a difference between the number of antennas and the number of users, is desired.
- the present invention provides a wireless communication system and method using multiple antennas, which allow a nulling process to be performed on multiple diversity antennas in a high-speed downlink packet access environment by feeding back information on a channel state from each mobile station to a base station using a scheme of expanding a multi-user diversity scheduling method to a spatial axis, selecting a weight satisfying a predetermined condition based on multi-user diversity scheduling, and applying the selected weight to transmission antennas so that a peak throughput can be guaranteed.
- a wireless communication system including a base station that applies predetermined weight vectors to multi-user signals and transmits the multi-user signals through a plurality of transmission antennas; and a plurality of mobile stations that receive and process the multi-user signals, wherein each of the plurality of mobile station includes: a signal reception unit that processes the multi-user signals; and a feedback signal generation unit that estimates channel characteristics, over which the multi-user signals have been transmitted, from the multi-user signals, classifies a plurality of weight vectors to be applied to the estimated channel characteristics into a plurality of sets such that vectors orthogonal to one another are classified into a single set, selects a set maximizing a transmission capacity from among the classified sets, and feeds back weight indexes of weight vectors included in the selected set and weighted channel information to the base station.
- a number of the plurality of weight vectors included in each set may be equal to a number of the plurality of transmission antennas.
- the weight indexes fed back by the feedback signal generation unit may be used as information to determine the predetermined weight vectors in the base station.
- the feedback signal generation unit may include a channel characteristic estimator that estimates the channel characteristics, a quadrature weight set classifier that groups a predetermined number of vectors that are orthogonal to one another from among the plurality of weight vectors into a single set and outputs the weight indexes of the weight vectors of each set, a plurality of Signal Interference to Noise Ratio (SINR) calculators, each of which applies weight vectors included in each set to the channel characteristics and calculates SINRs using the weighted channel characteristics, a plurality of capacity calculators, each of which correspond to one of the plurality of SINR calculators, and each of which calculates transmission capacities using SINRs received from a corresponding one of the plurality of SINR calculators and sums the transmission capacities, a peak capacity selection unit that selects a capacity calculator giving a peak of the summed transmission capacities, and outputs SINRs that are received from an SINR calculator corresponding to the selected capacity calculator and weight indexes corresponding to the selected capacity calculator, and an information feedback unit that feeds
- the base station and the plurality of mobile stations may comprise a same table in which indexes correspond to weight vectors, respectively.
- the base station may further include a feedback signal processing unit that classifies weight indexes and SINRs, which are received from the plurality of mobile stations, for each of the plurality of mobile stations, reclassifies the classified SINRs by the weight indexes, selects a peak SINR from among the classified SINRs, classifies weight vectors corresponding to the weight indexes into a plurality of sets, selects a set giving a peak transmission capacity from among the sets, outputs weight indexes included in the selected set and predetermined types of information measured from the weight indexes and the peak SINR.
- a feedback signal processing unit that classifies weight indexes and SINRs, which are received from the plurality of mobile stations, for each of the plurality of mobile stations, reclassifies the classified SINRs by the weight indexes, selects a peak SINR from among the classified SINRs, classifies weight vectors corresponding to the weight indexes into a plurality of sets, selects a set giving a peak transmission capacity from among the sets, outputs
- a number of the plurality of weight vectors included in each set may be equal to a number of the plurality of transmission antennas.
- the feedback signal processing unit may include a feedback information analyzer that classifies the weight indexes and the SINRs, which are received from the mobile stations, for each of the mobile stations, a weight classifier that reclassifies the classified SINRs by the weight indexes, a plurality of peak selectors each of which selects a peak SINR from among the reclassified SINRs, a quadrature combination unit that combines weight vectors that are orthogonal to one another into a single set from among the weight vectors corresponding to the weight indexes, a plurality of capacity generators each of which calculates transmission capacities from peak SINRs corresponding to weight indexes of weight vectors included in each set and sums the calculated transmission capacities, and a peak capacity selector that selects a peak value from among values output from the capacity generators and outputs weight indexes included in a set corresponding to the selected peak value, mobile station indexes, and power and modulation coding information obtained from the peak SINRs.
- a feedback information analyzer that classifies
- the base station may further include a signal transmission unit that transmits the multi-user signals through the plurality of transmission antennas, the signal transmission unit including: a channel selector that selects channels corresponding to the mobile station indexes output from the peak capacity selector from among a plurality of channels, a plurality of power and modulation coding controllers that control powers of the selected channels and modulate and code the selected channels, according to the power and modulation coding information output from the peak capacity selector, a plurality of spectrum spreaders that spread signals output from the respective power and modulation coding controllers using predetermined spreading signals, respectively, and a signal processor that applies a number of transmission antenna weights equal to the number of the plurality of transmission antennas to signals output from each spectrum spreader, sums the transmission antenna weighted signals for each transmission antenna, and outputs results of summations.
- a channel selector that selects channels corresponding to the mobile station indexes output from the peak capacity selector from among a plurality of channels
- each of the spectrum spreaders may use a spread spectrum code sequence ⁇ c[k,i](j)
- j 1, . . . , K SF ⁇ as the predetermined spreading signal, and the spread spectrum code sequence may be configured such that a spectrum code sequence of a k-th user is orthogonal to that of other users or the k-th user has a same characteristic as other users, where K SF has a value of one (1) or a greater value.
- the transmission antenna weights may correspond to the weight indexes output from the peak capacity selector.
- the signal reception unit of each mobile station may despread the received multi-user signals by applying different delays to respective paths, and may apply weights reflecting SINR characteristics of the despread multi-user signals for each path.
- the base station may further include a signal transmission unit that transmits the multi-user signal through the plurality of transmission antennas, the signal transmission unit including a channel selector that selects channels corresponding to mobile station indexes output from the feedback signal processing unit from among a plurality of channels, a plurality of power and modulation coding controllers that control powers of the selected channels and modulate and code the selected channels, according to the predetermined types of information output from the feedback signal processing unit, a plurality of spectrum spreaders that spreads signals output from the respective power and modulation coding controllers using predetermined spreading signals, respectively, and a signal processor that applies a number of transmission antenna weights equal to a number of the plurality of transmission antennas to signals output from each spectrum spreader, sums the transmission antenna weighted signals for each transmission antenna, and outputs results of summations.
- a signal transmission unit that transmits the multi-user signal through the plurality of transmission antennas, the signal transmission unit including a channel selector that selects channels corresponding to mobile station indexes output from the feedback signal
- the signal reception unit of each of the plurality of mobile stations may despread the received multi-user signals by applying different delays to each path, and may apply weights reflecting SINR characteristics of the despread multi-user signals for each path.
- a mobile station that receives a user signal including multi-user signals from a base station, the mobile station including a signal reception unit that processes the user signal, and a feedback signal generation unit that estimates channel characteristics, over which the multi-user signals have been transmitted, from the multi-user signals, classifies a plurality of weight vectors to be applied to the estimated channel characteristics into a plurality of sets, selects a set maximizing a transmission capacity from among the classified sets, and feeds back indexes of weight vectors included in the selected set and weighted channel information obtained from weighted channel characteristics corresponding to the selected set to the base station.
- a number of weight vectors included in each set may be equal to a number of the plurality of transmission antennas included in the base station.
- the plurality of weight vectors used by the mobile station may be the same as the plurality of weight vectors used by the base station.
- the feedback signal generation unit may include a channel characteristic estimator that estimates the channel characteristics, a quadrature weight set classifier that groups a predetermined number of vectors that are orthogonal to one another from among the plurality of weight vectors into a single set and outputs the weight indexes of the weight vectors of each set, a plurality of Signal Interference to Noise Ratio (SINR) calculators, each of which separately applies weight vectors included in each set to the channel characteristics, calculates power of each weighted channel characteristic, and calculates SINRs using the calculated power, a plurality of capacity calculators, each of which correspond to one of the plurality of SINR calculators and each of which calculates transmission capacities using SINRs received from a corresponding one of the plurality of SINR calculators and sums the transmission capacities, a peak capacity selection unit that selects a capacity calculator giving a peak of the summed transmission capacities, and outputs SINRs that are received from an SINR calculator corresponding to the selected capacity calculator and weight indexes corresponding to
- SINR
- a base station that processes a user signal based on mobile station index information for channel selection and Signal Interference to Noise Ratio (SINR) information of selected channels, information being fed back from a plurality of mobile stations, and transmits the processed access signal through a plurality of antennas
- the base station including a feedback signal processing unit that classifies indexes and SINRs, which are received from the plurality of mobile stations, for each of the mobile stations, reclassifies the classified SINRs by the weight indexes, selects a peak SINR from among the classified SINRs, classifies weight vectors corresponding to the weight indexes into a plurality of sets, selects a set giving a peak transmission capacity from among the sets, outputs mobile station indexes and predetermined types of information measured from the peak SINR that correspond to the selected set, and a signal transmission unit that selects channels, over which the user signals are to be transmitted, using the predetermined types of information output from the feedback signal processing unit, modulates
- the feedback signal processing unit may include a feedback information analyzer that classifies the weight indexes and the SINRs, which are received from the mobile stations, for each mobile station, a weight classifier that reclassifies the classified SINRs by the weight indexes, a plurality of peak selectors each of which selects a peak SINR from among the reclassified SINRs, a quadrature combination unit that combines weight vectors that are orthogonal to one another into a single set from among the weight vectors corresponding to the weight indexes, a plurality of capacity generators each of which calculates transmission capacities from peak SINRs corresponding to weight indexes of weight vectors included in each set and sums the calculated transmission capacities, and a peak capacity selector that selects a peak value from among values output from the capacity generators and outputs weight indexes included in a set corresponding to the selected peak value, mobile station indexes, and power and modulation coding information obtained from the peak SINRs.
- a feedback information analyzer that classifies the weight
- the signal transmission unit may include a channel selector that selects channels corresponding to mobile station indexes output from the feedback signal processing unit from among a plurality of channels, a plurality of power and modulation coding controllers that control power of the selected channels and modulate and code the selected channels, according to the predetermined types of information output from the feedback signal processing unit, a plurality of spectrum spreaders that spreads signals output from the respective power and modulation coding controllers using predetermined spreading signals, respectively, and a signal processor that applies weights vectors corresponding to the respective selected channels to signals output from each spectrum spreader, sums the weighted signals for each transmission antenna, and outputs results of summations through the respective corresponding antennas.
- a channel selector that selects channels corresponding to mobile station indexes output from the feedback signal processing unit from among a plurality of channels
- a plurality of power and modulation coding controllers that control power of the selected channels and modulate and code the selected channels, according to the predetermined types of information output from the feedback signal processing unit
- a wireless communication method including transmitting multi-user signals through a plurality of transmission antennas from a base station, receiving and processing the multi-user signals by a mobile station, estimating characteristics of channels, through each of which the multi-user signals are transmitted, from the detected multi-user signals, classifying a plurality of weight vectors to be applied to the measured channel characteristics into sets such that a predetermined number of weight vectors orthogonal to one another is grouped into a single set, applying each of weight vectors included in each set to the channel characteristics to generate weighted channel characteristics and selecting a set maximizing a transmission capacity based on the weighted channel characteristics of each set, and feeding back indexes of the weight vectors included in the selected set and weighed channel information obtained from the weighted channel characteristics corresponding to the selected set.
- the plurality of weight vectors used by the mobile station may be the same as those used in the base station.
- the method may further include the base station classifying weight indexes and weighted channel information, which are received from a plurality of mobile stations, for each of the mobile stations, reclassifying the weighted channel information by the weight indexes, selecting peak weighted channel information from each reclassified weighted channel information corresponding to each weight index and classifying weight vectors corresponding to the weight indexes into sets by combining a predetermined number of vectors orthogonal to one another into a single set, selecting a set maximizing the transmission capacity based on the peak weighted channel information corresponding to weight vectors included in each set, and outputting mobile station indexes belonging to the selected set and predetermined types of information measured from peak weighted channel information corresponding to the selected set.
- the weighted channel information may indicate a Signal Interference to Noise Ratio (SINR), and the predetermined types of information may be power, modulation, and coding information.
- SINR Signal Interference to Noise Ratio
- the method may further include the base station selecting channels corresponding to the mobile station indexes from among a plurality of channels, controlling a power of each of the selected channels and modulating and coding the selected channels according to the power, modulation, and coding information, spreading signals, which have been transmitted through the power-controlled, modulated, and coded channels using predetermined spreading signals, and applying weight vectors corresponding to the selected channels to spreading signal, summing the weighted signals for each transmission antenna, and outputting a result of summing the signals through each corresponding transmission antenna.
- FIG. 1 is a schematic block diagram of a wireless communication system according to an embodiment of the present invention
- FIG. 2 is a schematic block diagram of a signal transmission unit shown in FIG. 1 ;
- FIG. 3 is a schematic block diagram of a feedback signal generation unit shown in FIG. 1 ;
- FIG. 4 illustrates an example of an operation of a quadrature weight set classifier shown in FIG. 3 ;
- FIG. 5 is a diagram of an embodiment of a Signal to Interference and Noise Ratio (SINR) calculator shown in FIG. 3 based on the operation illustrated in FIG. 4 ; and
- SINR Signal to Interference and Noise Ratio
- FIG. 6 is a schematic block diagram of a feedback signal processing unit shown in FIG. 1 .
- FIG. 1 is a schematic block diagram of a wireless communication system according to an embodiment of the present invention.
- the wireless communication system includes a base station 100 and a plurality of mobile stations 120 and 130 that communicate with the base station 100 through multichannels 110 .
- the base station 100 includes a signal transmission unit 101 , a feedback signal processing unit 102 , and two or more transmission antennas (not shown) for signal transmission.
- Each of the mobile stations 120 and 130 includes a signal reception unit 121 , a feedback signal generation unit 122 , and one or more reception antenna (not shown).
- the feedback signal processing unit 102 of the base station 100 processes a signal fed back from the feedback signal generation unit 122 of each of the mobile stations 120 and 130 .
- the signal transmission unit 101 selects channels to be used for signal transmission referring to predetermined information output from the feedback signal processing unit 102 , controls transmission power and modulation coding operations, and transmits signals using a beam-forming method. According to the beam-forming method, the signal transmission unit 101 processes the signals to be transmitted using a predetermined method, applies weights to them, and then transmits the signal through a plurality of antennas.
- channels for mobile stations are distinguished from each another.
- the signal reception unit 121 detects a signal by performing a process such as despreading with different delays applied to respective signals received through the channels selected by the signal transmission unit 101 over multipaths.
- the feedback signal generation unit 122 estimates channel characteristics from pilot signals received through reception antennas, generates various types of information based on the estimated channel characteristics, and feeds the information back to the base station 100 .
- FIG. 2 is a schematic block diagram of the signal transmission unit 101 .
- the signal transmission unit 101 includes a channel selector 200 , a power and modulation coding (P-AMC) control unit 210 , a spread spectrum unit 220 , a weight multiplication unit 230 , an adding unit 240 , and an antenna unit 250 .
- P-AMC power and modulation coding
- the channel selector 200 selects N channels from among high-speed downlink shared channels HS-DSCH 1 through HS-DSCH K for K mobile stations according to a selection signal ⁇ k c (k)
- k 1, . . . , N ⁇ received from the feedback signal processing unit 102 .
- N channels are selected based on Channel Quality Information (CQI) to maximize a transmission capacity.
- CQI Channel Quality Information
- the P-AMC control unit 210 includes N P-AMC controllers 211 and 212 , each of which controls a power of each channel selected by the channel selector 200 and modulates and codes the channels. Modulation is performed using predetermined modulation orders a m [k c (k)
- k 1, . . . , N] output from the feedback signal processing unit 102 .
- a modulation order indicates a modulation method for each channel, for example, Quadrature Phase Shift Keying (QPSK) or 16-Quadrature Amplitude Modulation (16-QAM).
- Coding means error correction coding for the N high-speed downlink shared channels according to a predetermined coding rate ⁇ c[k c (k)]
- k 1, . . .
- N ⁇ output from the feedback signal processing unit 102 .
- Power is controlled by multiplying the square root of each power value output from the feedback signal processing unit 102 , ⁇ E 1/2 [k c (k)]
- k 1, . . . , N ⁇ is output from each of the P-AMC controllers 211 and 212 .
- s[k](i) is an i-th symbol data of a k-th user, which has been modulated and coded.
- the spread spectrum unit 220 includes N spectrum spreaders 221 and 222 .
- Each of the N spectrum spreaders 221 and 222 operates the signal x[k c (k)] output from a corresponding P-AMC controller 211 or 212 with a spreading signal ⁇ a[k c (k),i](t)
- k 1, . . . , N ⁇ according to Formula (2).
- a[k,i](t) is a response at a time “t” to the spreading signal for the i-th symbol data of the k-th user.
- T is a length of a single symbol
- K SF is the order of a spreading filter
- p(t) is a function of a chip pulse shape
- T c is a length of a chip
- c[k,i](j) is a j-th chip of a spread spectrum code for the i-th symbol data of the k-th user.
- the weight multiplication unit 230 includes a plurality of weight multipliers 231 , 232 , 233 , and 234 , which multiply N weights by the signals output from the N spectrum spreaders 221 and 222 , respectively.
- N is the number of antennas. More specifically, each of the weights ⁇ w Tx [k c (k),n]
- each of the weight multipliers 231 through 234 outputs a signal ⁇ w Tx [k c (k),n] ⁇ x c [k c (k)](t)
- the adding unit 240 includes N adders 241 and 242 each of which adds the signals output from the weight multiplication unit 230 in correspondence to each of the N antennas and a pilot signal of each antenna, ⁇ PICH n
- n 1, . . . , N ⁇ .
- the antenna unit 250 transmits signals
- the signal reception unit 121 of each of the mobile stations 120 and 130 receives signals, into which different channel characteristics are mixed after the signals are transmitted from the signal transmission unit 101 of the base station 101 over the multichannel 110 .
- M is the number of mobile station reception antennas
- L is the number of multipaths
- h[m,n,l] is a channel response corresponding to an n-th base station transmission antenna, an m-th mobile station reception antenna, and an l-th path.
- the signal reception unit 121 despreads the received signal by applying different delays to respective paths and multiplies the despread signal by weights reflecting the Signal to Interference and Noise Ratio (SINR) characteristic of the despread signal.
- SINR Signal to Interference and Noise Ratio
- despreading is performed according to Formula (3).
- l 0 indicates a finger number of the RAKE receiver of the mobile station
- d(l 0 ) indicates a chip delay value of a l 0 -th finger
- n′[m](t) indicates noise that is received by an m-th mobile station reception antenna and extracted through despreading.
- the self-signal y d [m](t), the self interference signal y SI [m](t), and the multi-user interference signal y MAI [m](t), which are produced during despreading according to Formula (3), can be expressed by Formula (4).
- the despread signal obtained according to Formulas (3) and (4) may be expressed by Formula (5).
- the despread signal can be combined with weights ⁇ w Rx [m,l 0 ]
- w Rx [w Rx [1,0] w Rx [2,0] . . . w Rx [1,1] w Rx [2,1] . . . w Rx [M, L 0 ⁇ 1]] T
- y Rx [y[1,0] y[2,0] . . . w[1,1] w[2,1] . . . w[M, L 0 ⁇ 1]] T .
- a weight w Tx or a weight ⁇ w Tx,l ⁇ is expressed as a factor because a base station transmission weight used for a self-signal and a self interference signal is different from that used for another user interference signal, and they are expressed by w Tx and ⁇ w Tx,l ⁇ , respectively, which are orthogonal to each other.
- the SINR may be calculated by Formula (7).
- w Rx [m,l] is a weight applied to each finger, each reception antenna included in a motile station, and is different from a weight w Tx , applied to a base station transmission antenna.
- the feedback signal generation unit 122 of each of the mobile stations 120 and 130 extracts pilot signals from received signals, estimates multi-antenna multipath channel characteristics from the extracted pilot signals, performs predetermined processes according to the estimated multi-antennas multipath channel characteristics to generate predetermined information, and transmits the predetermined information to the feedback signal processing unit 102 of the base station 100 .
- Such an operation of the feedback signal generation unit 122 will be described in detail below.
- FIG. 3 is a schematic block diagram of the feedback signal generation unit 122 .
- the feedback signal generation unit 122 includes a channel characteristic estimator 300 , a quadrature weight set classifier 320 , an SINR calculation unit 330 , a capacity calculation unit 340 , a peak capacity selection unit 350 , and an information feedback unit 360 .
- the channel characteristic estimator 300 estimates multi-antenna multipath channel characteristics
- M is the number of mobile station reception antennas
- N is the number of base station antennas
- L is the number of paths.
- the quadrature weight set classifier 320 groups weight vectors that are orthogonal to one another into a single set.
- the number of weight vectors included in each set is the same as the number N of transmission antennas.
- Weights constituting each weight vector are values upon which the base station 100 and the mobile stations 120 and 130 agree in advance and can be prepared in the form of a table.
- the base station and the mobile station may have the same weight vector table. More specifically, if the base station sends only an index of a weight vector, the mobile station may search for the received index in the table to find the corresponding weight vector.
- FIG. 4 illustrates an example of such an operation of the quadrature weight set classifier 320 .
- the quadrature weight set classifier 320 groups the weight vectors into sets ⁇ w(1), w(2), w(3) ⁇ , ⁇ w(1), w(4), w(5) ⁇ , ⁇ w(2), w(6), w(7) ⁇ , and ⁇ w(3), w(8), w(9) ⁇ , outputs the sets of weight vectors to SINR calculators 331 and 332 , and outputs sets of indexes of the respective weight vectors, i.e., ⁇ 1,2,3 ⁇ , ⁇ 1,4,5 ⁇ , ⁇ 2,6,7 ⁇ , and ⁇ 3,8,9 ⁇ , to the peak capacity selection unit 350 .
- the SINR calculation unit 330 includes as many SINR calculators 331 and 332 as the number of sets classified by the quadrature weight set classifier 320 .
- Each of the SINR calculators 331 and 332 receives weight vectors included in each set of weight vectors output from the quadrature weight set classifier 320 .
- FIG. 5 is a diagram of an embodiment of the SINR calculator 331 based on the operation illustrated in FIG. 4 . As shown in FIG.
- first through third SINR calculators 3310 , 3311 , and 3312 each calculates an SINR using Formula (7) or Formula (8), as which Formula (7) is rewritten, the channel characteristic input from the channel characteristic estimator 300 , and a weight set ⁇ w Tx , ⁇ w Tx,I ⁇ input from the quadrature weight set classifier 320 .
- the capacity calculation unit 340 includes as many capacity calculators 341 and 342 as the number of the SINR calculators 331 and 332 .
- Each of the capacity calculators 341 and 342 calculates N capacities from N SINRs output from each of the SINR calculators 331 and 332 based on a Shannon bound ⁇ log 2 [1+SINR(k)]
- k 1, . . . , N ⁇ , and sums the calculated N capacities.
- the peak capacity selection unit 350 includes a peak selector 351 , an SINR selector 352 , and an index selector 353 .
- the peak selector 351 compares output values of the capacity calculators 341 and 342 and selects a peak value.
- the SINR selector 352 outputs the N SINRs ⁇ SINR[n]
- n 1, . . . , N ⁇ received from the SINR calculator 331 or 332 corresponding to the peak value selected by the peak selector 351 .
- the information feedback unit 360 converts the SINRs and the indexes output from the peak capacity selection unit 350 into a feedback signal suitable for transmission and forwards the feedback signal to the feedback signal processing unit 102 of the base station 100 .
- the feedback signal processing unit 102 combines the received indexes and SINRs for each mobile station to restore feedback information, and performs predetermined processes on the feedback information to generate various types of information to be applied to transmission antennas.
- FIG. 6 is a schematic block diagram of the feedback signal processing unit 102 .
- the feedback signal processing unit 102 includes a feedback information analyzer 500 , a weight classifier 510 , a peak selection unit 520 , a quadrature combination unit 530 , a capacity generation unit 540 , and a peak capacity selector 550 .
- the feedback information analyzer 500 analyzes feedback signals received from the respective mobile stations 120 and 130 and extracts SINRs and weight indexes.
- the weight classifier 510 combines SINRs and weight indexes by mobile stations and classifies the combined results ⁇ i[k,n],SINR([k,n]) ⁇ for a k-th mobile station by the weight indexes ⁇ i[k,n] ⁇ . As a result, a plurality of SINRs correspond to a single index.
- the peak selection unit 520 includes a plurality of peak selectors 521 and 522 , each of which selects a peak SINR from among the plurality of SINRs corresponding to each index.
- the quadrature combination unit 530 combines weight vectors, which correspond to weight indexes ⁇ i[k,n] ⁇ and orthogonal to one another, into a single set, as shown in FIG. 4 , and outputs a set of SINRs corresponding to each set of the weight vectors to the capacity generation unit 540 .
- the capacity generation unit 540 includes as many capacity generators 541 and 542 as the number of sets of SINRs output from the quadrature combination unit 530 .
- Each of the capacity generators 541 and 542 calculates capacities for the SINRs included in each set based on the Shannon bound and sums the calculated capacities.
- any type of conventional method such as a method using a table, may be used.
- the generated power and modulation coding information is output to the signal transmission unit 101 of the base station 100 .
- mobile stations obtain quadrature weight vectors reflecting downlink characteristics of multiple antenna and multipath channels and quadrature combinations of SINRs corresponding to channel state information reflecting the orthogonality and feed back to a base station quadrature weight vectors and quadrature combinations of SINRs, which can give a peak throughput, among the obtained quadrature weight vectors and quadrature combinations of SINRs. Then, the base station selects a combination corresponding to a peak throughput from among combinations of weights allowing a nulling process and applies the selected combination to transmission antennas thereof so that a transmission throughput of high speed downlink shared channels is maximized.
- a transmission capacity can be theoretically increased by a maximum of N*log 2 (1+SNR*K) times (where SNR is a signal-to-noise ratio) so that a Shannon capacity may be achieved.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Quality & Reliability (AREA)
- Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Mobile Radio Communication Systems (AREA)
- Radio Transmission System (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR2003-9909 | 2003-02-17 | ||
KR1020030009909A KR100571862B1 (ko) | 2003-02-17 | 2003-02-17 | 다중 안테나를 포함하는 이동통신 시스템 및 그 방법 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20040224725A1 US20040224725A1 (en) | 2004-11-11 |
US7406337B2 true US7406337B2 (en) | 2008-07-29 |
Family
ID=32677888
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/778,340 Active 2026-09-20 US7406337B2 (en) | 2003-02-17 | 2004-02-17 | Wireless communication system and method using multiple antennas |
Country Status (5)
Country | Link |
---|---|
US (1) | US7406337B2 (ko) |
EP (1) | EP1447925B1 (ko) |
KR (1) | KR100571862B1 (ko) |
CN (1) | CN1297079C (ko) |
DE (1) | DE602004003728T2 (ko) |
Cited By (173)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050117520A1 (en) * | 2002-09-13 | 2005-06-02 | Kenichi Miyoshi | Radio transmission device and radio transmission method |
US20070281624A1 (en) * | 2004-11-04 | 2007-12-06 | Motorola, Inc. | Method and apparatus for channel feedback |
US20080273618A1 (en) * | 2004-11-16 | 2008-11-06 | Antonio Forenza | Precoding System and Method for Multi-User Transmission in Multiple Antenna Wireless Systems |
US20090262676A1 (en) * | 2008-04-22 | 2009-10-22 | Motorola, Inc. | Communication system and method of operation therefor |
US20100086072A1 (en) * | 2008-10-07 | 2010-04-08 | Motorola, Inc. | Communication system and method of operation therefor |
US20100130151A1 (en) * | 2006-11-14 | 2010-05-27 | Yozo Shoji | Channel characteristic analyzing apparatus and method |
US20100220608A1 (en) * | 2006-03-24 | 2010-09-02 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and arrangement in a telecommunication system |
US20110081871A1 (en) * | 2009-10-02 | 2011-04-07 | Karl Molnar | Channel-dependent scheduling and link adaptation |
US8335167B1 (en) * | 2009-02-02 | 2012-12-18 | Marvell International Ltd. | Refining beamforming techniques for phased-array antennas |
US20140153418A1 (en) * | 2012-12-04 | 2014-06-05 | At&T Intellectual Property I, L.P. | Diagnosis of cellular network element states using radio frequency measurements |
US8953642B2 (en) | 2009-09-15 | 2015-02-10 | Lg Electronics Inc. | Method and apparatus for transmitting a downlink reference signal in a wireless communication system supporting multiple antennas |
US9520945B2 (en) | 2014-10-21 | 2016-12-13 | At&T Intellectual Property I, L.P. | Apparatus for providing communication services and methods thereof |
US9525210B2 (en) | 2014-10-21 | 2016-12-20 | At&T Intellectual Property I, L.P. | Guided-wave transmission device with non-fundamental mode propagation and methods for use therewith |
US9531427B2 (en) | 2014-11-20 | 2016-12-27 | At&T Intellectual Property I, L.P. | Transmission device with mode division multiplexing and methods for use therewith |
US9564947B2 (en) | 2014-10-21 | 2017-02-07 | At&T Intellectual Property I, L.P. | Guided-wave transmission device with diversity and methods for use therewith |
US9571209B2 (en) | 2014-10-21 | 2017-02-14 | At&T Intellectual Property I, L.P. | Transmission device with impairment compensation and methods for use therewith |
US9577306B2 (en) | 2014-10-21 | 2017-02-21 | At&T Intellectual Property I, L.P. | Guided-wave transmission device and methods for use therewith |
US9608692B2 (en) | 2015-06-11 | 2017-03-28 | At&T Intellectual Property I, L.P. | Repeater and methods for use therewith |
US9608740B2 (en) | 2015-07-15 | 2017-03-28 | At&T Intellectual Property I, L.P. | Method and apparatus for launching a wave mode that mitigates interference |
US9615269B2 (en) | 2014-10-02 | 2017-04-04 | At&T Intellectual Property I, L.P. | Method and apparatus that provides fault tolerance in a communication network |
US9628116B2 (en) | 2015-07-14 | 2017-04-18 | At&T Intellectual Property I, L.P. | Apparatus and methods for transmitting wireless signals |
US9628854B2 (en) | 2014-09-29 | 2017-04-18 | At&T Intellectual Property I, L.P. | Method and apparatus for distributing content in a communication network |
US9640850B2 (en) | 2015-06-25 | 2017-05-02 | At&T Intellectual Property I, L.P. | Methods and apparatus for inducing a non-fundamental wave mode on a transmission medium |
US9653770B2 (en) | 2014-10-21 | 2017-05-16 | At&T Intellectual Property I, L.P. | Guided wave coupler, coupling module and methods for use therewith |
US9654173B2 (en) | 2014-11-20 | 2017-05-16 | At&T Intellectual Property I, L.P. | Apparatus for powering a communication device and methods thereof |
US9661505B2 (en) | 2013-11-06 | 2017-05-23 | At&T Intellectual Property I, L.P. | Surface-wave communications and methods thereof |
US9667317B2 (en) | 2015-06-15 | 2017-05-30 | At&T Intellectual Property I, L.P. | Method and apparatus for providing security using network traffic adjustments |
US9680670B2 (en) | 2014-11-20 | 2017-06-13 | At&T Intellectual Property I, L.P. | Transmission device with channel equalization and control and methods for use therewith |
US9685992B2 (en) | 2014-10-03 | 2017-06-20 | At&T Intellectual Property I, L.P. | Circuit panel network and methods thereof |
US9692101B2 (en) | 2014-08-26 | 2017-06-27 | At&T Intellectual Property I, L.P. | Guided wave couplers for coupling electromagnetic waves between a waveguide surface and a surface of a wire |
US9699785B2 (en) | 2012-12-05 | 2017-07-04 | At&T Intellectual Property I, L.P. | Backhaul link for distributed antenna system |
US9705571B2 (en) | 2015-09-16 | 2017-07-11 | At&T Intellectual Property I, L.P. | Method and apparatus for use with a radio distributed antenna system |
US9705561B2 (en) | 2015-04-24 | 2017-07-11 | At&T Intellectual Property I, L.P. | Directional coupling device and methods for use therewith |
US9722318B2 (en) | 2015-07-14 | 2017-08-01 | At&T Intellectual Property I, L.P. | Method and apparatus for coupling an antenna to a device |
US9729197B2 (en) | 2015-10-01 | 2017-08-08 | At&T Intellectual Property I, L.P. | Method and apparatus for communicating network management traffic over a network |
US9735833B2 (en) | 2015-07-31 | 2017-08-15 | At&T Intellectual Property I, L.P. | Method and apparatus for communications management in a neighborhood network |
US9742462B2 (en) | 2014-12-04 | 2017-08-22 | At&T Intellectual Property I, L.P. | Transmission medium and communication interfaces and methods for use therewith |
US9749053B2 (en) | 2015-07-23 | 2017-08-29 | At&T Intellectual Property I, L.P. | Node device, repeater and methods for use therewith |
US9749013B2 (en) | 2015-03-17 | 2017-08-29 | At&T Intellectual Property I, L.P. | Method and apparatus for reducing attenuation of electromagnetic waves guided by a transmission medium |
US9748626B2 (en) | 2015-05-14 | 2017-08-29 | At&T Intellectual Property I, L.P. | Plurality of cables having different cross-sectional shapes which are bundled together to form a transmission medium |
US9762289B2 (en) | 2014-10-14 | 2017-09-12 | At&T Intellectual Property I, L.P. | Method and apparatus for transmitting or receiving signals in a transportation system |
US9768833B2 (en) | 2014-09-15 | 2017-09-19 | At&T Intellectual Property I, L.P. | Method and apparatus for sensing a condition in a transmission medium of electromagnetic waves |
US9769020B2 (en) | 2014-10-21 | 2017-09-19 | At&T Intellectual Property I, L.P. | Method and apparatus for responding to events affecting communications in a communication network |
US9769128B2 (en) | 2015-09-28 | 2017-09-19 | At&T Intellectual Property I, L.P. | Method and apparatus for encryption of communications over a network |
US9780834B2 (en) | 2014-10-21 | 2017-10-03 | At&T Intellectual Property I, L.P. | Method and apparatus for transmitting electromagnetic waves |
US9787412B2 (en) | 2015-06-25 | 2017-10-10 | At&T Intellectual Property I, L.P. | Methods and apparatus for inducing a fundamental wave mode on a transmission medium |
US9793954B2 (en) | 2015-04-28 | 2017-10-17 | At&T Intellectual Property I, L.P. | Magnetic coupling device and methods for use therewith |
US9793955B2 (en) | 2015-04-24 | 2017-10-17 | At&T Intellectual Property I, Lp | Passive electrical coupling device and methods for use therewith |
US9794003B2 (en) | 2013-12-10 | 2017-10-17 | At&T Intellectual Property I, L.P. | Quasi-optical coupler |
US9793951B2 (en) | 2015-07-15 | 2017-10-17 | At&T Intellectual Property I, L.P. | Method and apparatus for launching a wave mode that mitigates interference |
US9800327B2 (en) | 2014-11-20 | 2017-10-24 | At&T Intellectual Property I, L.P. | Apparatus for controlling operations of a communication device and methods thereof |
US9820146B2 (en) | 2015-06-12 | 2017-11-14 | At&T Intellectual Property I, L.P. | Method and apparatus for authentication and identity management of communicating devices |
US9838078B2 (en) | 2015-07-31 | 2017-12-05 | At&T Intellectual Property I, L.P. | Method and apparatus for exchanging communication signals |
US9836957B2 (en) | 2015-07-14 | 2017-12-05 | At&T Intellectual Property I, L.P. | Method and apparatus for communicating with premises equipment |
US9838896B1 (en) | 2016-12-09 | 2017-12-05 | At&T Intellectual Property I, L.P. | Method and apparatus for assessing network coverage |
US9847566B2 (en) | 2015-07-14 | 2017-12-19 | At&T Intellectual Property I, L.P. | Method and apparatus for adjusting a field of a signal to mitigate interference |
US9847850B2 (en) | 2014-10-14 | 2017-12-19 | At&T Intellectual Property I, L.P. | Method and apparatus for adjusting a mode of communication in a communication network |
US9853342B2 (en) | 2015-07-14 | 2017-12-26 | At&T Intellectual Property I, L.P. | Dielectric transmission medium connector and methods for use therewith |
US9860075B1 (en) | 2016-08-26 | 2018-01-02 | At&T Intellectual Property I, L.P. | Method and communication node for broadband distribution |
US9866309B2 (en) | 2015-06-03 | 2018-01-09 | At&T Intellectual Property I, Lp | Host node device and methods for use therewith |
US9866276B2 (en) | 2014-10-10 | 2018-01-09 | At&T Intellectual Property I, L.P. | Method and apparatus for arranging communication sessions in a communication system |
US9865911B2 (en) | 2015-06-25 | 2018-01-09 | At&T Intellectual Property I, L.P. | Waveguide system for slot radiating first electromagnetic waves that are combined into a non-fundamental wave mode second electromagnetic wave on a transmission medium |
US9871282B2 (en) | 2015-05-14 | 2018-01-16 | At&T Intellectual Property I, L.P. | At least one transmission medium having a dielectric surface that is covered at least in part by a second dielectric |
US9871283B2 (en) | 2015-07-23 | 2018-01-16 | At&T Intellectual Property I, Lp | Transmission medium having a dielectric core comprised of plural members connected by a ball and socket configuration |
US9876571B2 (en) | 2015-02-20 | 2018-01-23 | At&T Intellectual Property I, Lp | Guided-wave transmission device with non-fundamental mode propagation and methods for use therewith |
US9876264B2 (en) | 2015-10-02 | 2018-01-23 | At&T Intellectual Property I, Lp | Communication system, guided wave switch and methods for use therewith |
US9876605B1 (en) | 2016-10-21 | 2018-01-23 | At&T Intellectual Property I, L.P. | Launcher and coupling system to support desired guided wave mode |
US9882277B2 (en) | 2015-10-02 | 2018-01-30 | At&T Intellectual Property I, Lp | Communication device and antenna assembly with actuated gimbal mount |
US9882257B2 (en) | 2015-07-14 | 2018-01-30 | At&T Intellectual Property I, L.P. | Method and apparatus for launching a wave mode that mitigates interference |
US9887447B2 (en) | 2015-05-14 | 2018-02-06 | At&T Intellectual Property I, L.P. | Transmission medium having multiple cores and methods for use therewith |
US9893795B1 (en) | 2016-12-07 | 2018-02-13 | At&T Intellectual Property I, Lp | Method and repeater for broadband distribution |
US9904535B2 (en) | 2015-09-14 | 2018-02-27 | At&T Intellectual Property I, L.P. | Method and apparatus for distributing software |
US9906269B2 (en) | 2014-09-17 | 2018-02-27 | At&T Intellectual Property I, L.P. | Monitoring and mitigating conditions in a communication network |
US9912382B2 (en) | 2015-06-03 | 2018-03-06 | At&T Intellectual Property I, Lp | Network termination and methods for use therewith |
US9911020B1 (en) | 2016-12-08 | 2018-03-06 | At&T Intellectual Property I, L.P. | Method and apparatus for tracking via a radio frequency identification device |
US9913139B2 (en) | 2015-06-09 | 2018-03-06 | At&T Intellectual Property I, L.P. | Signal fingerprinting for authentication of communicating devices |
US9912027B2 (en) | 2015-07-23 | 2018-03-06 | At&T Intellectual Property I, L.P. | Method and apparatus for exchanging communication signals |
US9912419B1 (en) | 2016-08-24 | 2018-03-06 | At&T Intellectual Property I, L.P. | Method and apparatus for managing a fault in a distributed antenna system |
US9917341B2 (en) | 2015-05-27 | 2018-03-13 | At&T Intellectual Property I, L.P. | Apparatus and method for launching electromagnetic waves and for modifying radial dimensions of the propagating electromagnetic waves |
US9930668B2 (en) | 2013-05-31 | 2018-03-27 | At&T Intellectual Property I, L.P. | Remote distributed antenna system |
US9927517B1 (en) | 2016-12-06 | 2018-03-27 | At&T Intellectual Property I, L.P. | Apparatus and methods for sensing rainfall |
US9948354B2 (en) | 2015-04-28 | 2018-04-17 | At&T Intellectual Property I, L.P. | Magnetic coupling device with reflective plate and methods for use therewith |
US9948333B2 (en) | 2015-07-23 | 2018-04-17 | At&T Intellectual Property I, L.P. | Method and apparatus for wireless communications to mitigate interference |
US9954287B2 (en) | 2014-11-20 | 2018-04-24 | At&T Intellectual Property I, L.P. | Apparatus for converting wireless signals and electromagnetic waves and methods thereof |
US9967173B2 (en) | 2015-07-31 | 2018-05-08 | At&T Intellectual Property I, L.P. | Method and apparatus for authentication and identity management of communicating devices |
US9973940B1 (en) | 2017-02-27 | 2018-05-15 | At&T Intellectual Property I, L.P. | Apparatus and methods for dynamic impedance matching of a guided wave launcher |
US9991580B2 (en) | 2016-10-21 | 2018-06-05 | At&T Intellectual Property I, L.P. | Launcher and coupling system for guided wave mode cancellation |
US9998870B1 (en) | 2016-12-08 | 2018-06-12 | At&T Intellectual Property I, L.P. | Method and apparatus for proximity sensing |
US9997819B2 (en) | 2015-06-09 | 2018-06-12 | At&T Intellectual Property I, L.P. | Transmission medium and method for facilitating propagation of electromagnetic waves via a core |
US9999038B2 (en) | 2013-05-31 | 2018-06-12 | At&T Intellectual Property I, L.P. | Remote distributed antenna system |
US10009065B2 (en) | 2012-12-05 | 2018-06-26 | At&T Intellectual Property I, L.P. | Backhaul link for distributed antenna system |
US10009067B2 (en) | 2014-12-04 | 2018-06-26 | At&T Intellectual Property I, L.P. | Method and apparatus for configuring a communication interface |
US10009063B2 (en) | 2015-09-16 | 2018-06-26 | At&T Intellectual Property I, L.P. | Method and apparatus for use with a radio distributed antenna system having an out-of-band reference signal |
US10009901B2 (en) | 2015-09-16 | 2018-06-26 | At&T Intellectual Property I, L.P. | Method, apparatus, and computer-readable storage medium for managing utilization of wireless resources between base stations |
US10020587B2 (en) | 2015-07-31 | 2018-07-10 | At&T Intellectual Property I, L.P. | Radial antenna and methods for use therewith |
US10020844B2 (en) | 2016-12-06 | 2018-07-10 | T&T Intellectual Property I, L.P. | Method and apparatus for broadcast communication via guided waves |
US10027397B2 (en) | 2016-12-07 | 2018-07-17 | At&T Intellectual Property I, L.P. | Distributed antenna system and methods for use therewith |
US10033108B2 (en) | 2015-07-14 | 2018-07-24 | At&T Intellectual Property I, L.P. | Apparatus and methods for generating an electromagnetic wave having a wave mode that mitigates interference |
US10033107B2 (en) | 2015-07-14 | 2018-07-24 | At&T Intellectual Property I, L.P. | Method and apparatus for coupling an antenna to a device |
US10044409B2 (en) | 2015-07-14 | 2018-08-07 | At&T Intellectual Property I, L.P. | Transmission medium and methods for use therewith |
US10051483B2 (en) | 2015-10-16 | 2018-08-14 | At&T Intellectual Property I, L.P. | Method and apparatus for directing wireless signals |
US10051629B2 (en) | 2015-09-16 | 2018-08-14 | At&T Intellectual Property I, L.P. | Method and apparatus for use with a radio distributed antenna system having an in-band reference signal |
US10069535B2 (en) | 2016-12-08 | 2018-09-04 | At&T Intellectual Property I, L.P. | Apparatus and methods for launching electromagnetic waves having a certain electric field structure |
US10074890B2 (en) | 2015-10-02 | 2018-09-11 | At&T Intellectual Property I, L.P. | Communication device and antenna with integrated light assembly |
US10079661B2 (en) | 2015-09-16 | 2018-09-18 | At&T Intellectual Property I, L.P. | Method and apparatus for use with a radio distributed antenna system having a clock reference |
US10090594B2 (en) | 2016-11-23 | 2018-10-02 | At&T Intellectual Property I, L.P. | Antenna system having structural configurations for assembly |
US10090606B2 (en) | 2015-07-15 | 2018-10-02 | At&T Intellectual Property I, L.P. | Antenna system with dielectric array and methods for use therewith |
US10103422B2 (en) | 2016-12-08 | 2018-10-16 | At&T Intellectual Property I, L.P. | Method and apparatus for mounting network devices |
US10103801B2 (en) | 2015-06-03 | 2018-10-16 | At&T Intellectual Property I, L.P. | Host node device and methods for use therewith |
US10135147B2 (en) | 2016-10-18 | 2018-11-20 | At&T Intellectual Property I, L.P. | Apparatus and methods for launching guided waves via an antenna |
US10135145B2 (en) | 2016-12-06 | 2018-11-20 | At&T Intellectual Property I, L.P. | Apparatus and methods for generating an electromagnetic wave along a transmission medium |
US10136434B2 (en) | 2015-09-16 | 2018-11-20 | At&T Intellectual Property I, L.P. | Method and apparatus for use with a radio distributed antenna system having an ultra-wideband control channel |
US10135146B2 (en) | 2016-10-18 | 2018-11-20 | At&T Intellectual Property I, L.P. | Apparatus and methods for launching guided waves via circuits |
US10139820B2 (en) | 2016-12-07 | 2018-11-27 | At&T Intellectual Property I, L.P. | Method and apparatus for deploying equipment of a communication system |
US10142086B2 (en) | 2015-06-11 | 2018-11-27 | At&T Intellectual Property I, L.P. | Repeater and methods for use therewith |
US10148016B2 (en) | 2015-07-14 | 2018-12-04 | At&T Intellectual Property I, L.P. | Apparatus and methods for communicating utilizing an antenna array |
US10144036B2 (en) | 2015-01-30 | 2018-12-04 | At&T Intellectual Property I, L.P. | Method and apparatus for mitigating interference affecting a propagation of electromagnetic waves guided by a transmission medium |
US10154493B2 (en) | 2015-06-03 | 2018-12-11 | At&T Intellectual Property I, L.P. | Network termination and methods for use therewith |
US10170840B2 (en) | 2015-07-14 | 2019-01-01 | At&T Intellectual Property I, L.P. | Apparatus and methods for sending or receiving electromagnetic signals |
US10168695B2 (en) | 2016-12-07 | 2019-01-01 | At&T Intellectual Property I, L.P. | Method and apparatus for controlling an unmanned aircraft |
US10178445B2 (en) | 2016-11-23 | 2019-01-08 | At&T Intellectual Property I, L.P. | Methods, devices, and systems for load balancing between a plurality of waveguides |
US10205655B2 (en) | 2015-07-14 | 2019-02-12 | At&T Intellectual Property I, L.P. | Apparatus and methods for communicating utilizing an antenna array and multiple communication paths |
US10224634B2 (en) | 2016-11-03 | 2019-03-05 | At&T Intellectual Property I, L.P. | Methods and apparatus for adjusting an operational characteristic of an antenna |
US10225025B2 (en) | 2016-11-03 | 2019-03-05 | At&T Intellectual Property I, L.P. | Method and apparatus for detecting a fault in a communication system |
US10243270B2 (en) | 2016-12-07 | 2019-03-26 | At&T Intellectual Property I, L.P. | Beam adaptive multi-feed dielectric antenna system and methods for use therewith |
US10243784B2 (en) | 2014-11-20 | 2019-03-26 | At&T Intellectual Property I, L.P. | System for generating topology information and methods thereof |
US10264586B2 (en) | 2016-12-09 | 2019-04-16 | At&T Mobility Ii Llc | Cloud-based packet controller and methods for use therewith |
US10291311B2 (en) | 2016-09-09 | 2019-05-14 | At&T Intellectual Property I, L.P. | Method and apparatus for mitigating a fault in a distributed antenna system |
US10291334B2 (en) | 2016-11-03 | 2019-05-14 | At&T Intellectual Property I, L.P. | System for detecting a fault in a communication system |
US10298293B2 (en) | 2017-03-13 | 2019-05-21 | At&T Intellectual Property I, L.P. | Apparatus of communication utilizing wireless network devices |
US10305190B2 (en) | 2016-12-01 | 2019-05-28 | At&T Intellectual Property I, L.P. | Reflecting dielectric antenna system and methods for use therewith |
US10312567B2 (en) | 2016-10-26 | 2019-06-04 | At&T Intellectual Property I, L.P. | Launcher with planar strip antenna and methods for use therewith |
US10320586B2 (en) | 2015-07-14 | 2019-06-11 | At&T Intellectual Property I, L.P. | Apparatus and methods for generating non-interfering electromagnetic waves on an insulated transmission medium |
US10326494B2 (en) | 2016-12-06 | 2019-06-18 | At&T Intellectual Property I, L.P. | Apparatus for measurement de-embedding and methods for use therewith |
US10326689B2 (en) | 2016-12-08 | 2019-06-18 | At&T Intellectual Property I, L.P. | Method and system for providing alternative communication paths |
US10340601B2 (en) | 2016-11-23 | 2019-07-02 | At&T Intellectual Property I, L.P. | Multi-antenna system and methods for use therewith |
US10340573B2 (en) | 2016-10-26 | 2019-07-02 | At&T Intellectual Property I, L.P. | Launcher with cylindrical coupling device and methods for use therewith |
US10341142B2 (en) | 2015-07-14 | 2019-07-02 | At&T Intellectual Property I, L.P. | Apparatus and methods for generating non-interfering electromagnetic waves on an uninsulated conductor |
US10340603B2 (en) | 2016-11-23 | 2019-07-02 | At&T Intellectual Property I, L.P. | Antenna system having shielded structural configurations for assembly |
US10340983B2 (en) | 2016-12-09 | 2019-07-02 | At&T Intellectual Property I, L.P. | Method and apparatus for surveying remote sites via guided wave communications |
US10340600B2 (en) | 2016-10-18 | 2019-07-02 | At&T Intellectual Property I, L.P. | Apparatus and methods for launching guided waves via plural waveguide systems |
US10348391B2 (en) | 2015-06-03 | 2019-07-09 | At&T Intellectual Property I, L.P. | Client node device with frequency conversion and methods for use therewith |
US10355367B2 (en) | 2015-10-16 | 2019-07-16 | At&T Intellectual Property I, L.P. | Antenna structure for exchanging wireless signals |
US10361489B2 (en) | 2016-12-01 | 2019-07-23 | At&T Intellectual Property I, L.P. | Dielectric dish antenna system and methods for use therewith |
US10359749B2 (en) | 2016-12-07 | 2019-07-23 | At&T Intellectual Property I, L.P. | Method and apparatus for utilities management via guided wave communication |
US10374316B2 (en) | 2016-10-21 | 2019-08-06 | At&T Intellectual Property I, L.P. | System and dielectric antenna with non-uniform dielectric |
US10382976B2 (en) | 2016-12-06 | 2019-08-13 | At&T Intellectual Property I, L.P. | Method and apparatus for managing wireless communications based on communication paths and network device positions |
US10389037B2 (en) | 2016-12-08 | 2019-08-20 | At&T Intellectual Property I, L.P. | Apparatus and methods for selecting sections of an antenna array and use therewith |
US10389029B2 (en) | 2016-12-07 | 2019-08-20 | At&T Intellectual Property I, L.P. | Multi-feed dielectric antenna system with core selection and methods for use therewith |
US10396887B2 (en) | 2015-06-03 | 2019-08-27 | At&T Intellectual Property I, L.P. | Client node device and methods for use therewith |
US10411356B2 (en) | 2016-12-08 | 2019-09-10 | At&T Intellectual Property I, L.P. | Apparatus and methods for selectively targeting communication devices with an antenna array |
US10439675B2 (en) | 2016-12-06 | 2019-10-08 | At&T Intellectual Property I, L.P. | Method and apparatus for repeating guided wave communication signals |
US10446936B2 (en) | 2016-12-07 | 2019-10-15 | At&T Intellectual Property I, L.P. | Multi-feed dielectric antenna system and methods for use therewith |
US10498044B2 (en) | 2016-11-03 | 2019-12-03 | At&T Intellectual Property I, L.P. | Apparatus for configuring a surface of an antenna |
US10530505B2 (en) | 2016-12-08 | 2020-01-07 | At&T Intellectual Property I, L.P. | Apparatus and methods for launching electromagnetic waves along a transmission medium |
US10535928B2 (en) | 2016-11-23 | 2020-01-14 | At&T Intellectual Property I, L.P. | Antenna system and methods for use therewith |
US10547348B2 (en) | 2016-12-07 | 2020-01-28 | At&T Intellectual Property I, L.P. | Method and apparatus for switching transmission mediums in a communication system |
US10601494B2 (en) | 2016-12-08 | 2020-03-24 | At&T Intellectual Property I, L.P. | Dual-band communication device and method for use therewith |
US10637149B2 (en) | 2016-12-06 | 2020-04-28 | At&T Intellectual Property I, L.P. | Injection molded dielectric antenna and methods for use therewith |
US10650940B2 (en) | 2015-05-15 | 2020-05-12 | At&T Intellectual Property I, L.P. | Transmission medium having a conductive material and methods for use therewith |
US10665942B2 (en) | 2015-10-16 | 2020-05-26 | At&T Intellectual Property I, L.P. | Method and apparatus for adjusting wireless communications |
US10679767B2 (en) | 2015-05-15 | 2020-06-09 | At&T Intellectual Property I, L.P. | Transmission medium having a conductive material and methods for use therewith |
US10694379B2 (en) | 2016-12-06 | 2020-06-23 | At&T Intellectual Property I, L.P. | Waveguide system with device-based authentication and methods for use therewith |
US10727599B2 (en) | 2016-12-06 | 2020-07-28 | At&T Intellectual Property I, L.P. | Launcher with slot antenna and methods for use therewith |
US10755542B2 (en) | 2016-12-06 | 2020-08-25 | At&T Intellectual Property I, L.P. | Method and apparatus for surveillance via guided wave communication |
US10777873B2 (en) | 2016-12-08 | 2020-09-15 | At&T Intellectual Property I, L.P. | Method and apparatus for mounting network devices |
US10784670B2 (en) | 2015-07-23 | 2020-09-22 | At&T Intellectual Property I, L.P. | Antenna support for aligning an antenna |
US10811767B2 (en) | 2016-10-21 | 2020-10-20 | At&T Intellectual Property I, L.P. | System and dielectric antenna with convex dielectric radome |
US10819035B2 (en) | 2016-12-06 | 2020-10-27 | At&T Intellectual Property I, L.P. | Launcher with helical antenna and methods for use therewith |
US10916969B2 (en) | 2016-12-08 | 2021-02-09 | At&T Intellectual Property I, L.P. | Method and apparatus for providing power using an inductive coupling |
US10938108B2 (en) | 2016-12-08 | 2021-03-02 | At&T Intellectual Property I, L.P. | Frequency selective multi-feed dielectric antenna system and methods for use therewith |
US11032819B2 (en) | 2016-09-15 | 2021-06-08 | At&T Intellectual Property I, L.P. | Method and apparatus for use with a radio distributed antenna system having a control channel reference signal |
US11750256B2 (en) * | 2002-11-04 | 2023-09-05 | Xr Communications Llc | Directed wireless communication |
Families Citing this family (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7139328B2 (en) * | 2004-11-04 | 2006-11-21 | Motorola, Inc. | Method and apparatus for closed loop data transmission |
KR100950644B1 (ko) * | 2005-03-04 | 2010-04-01 | 삼성전자주식회사 | 다중사용자 다중입출력 시스템의 피드백 방법 |
KR101124932B1 (ko) | 2005-05-30 | 2012-03-28 | 삼성전자주식회사 | 어레이 안테나를 이용하는 이동 통신 시스템에서의 데이터송/수신 장치 및 방법 |
US20060285606A1 (en) * | 2005-06-01 | 2006-12-21 | Nec Laboratories America, Inc. | Quantized Power Control in Multiple Antenna Communication System |
US7715863B2 (en) * | 2005-06-01 | 2010-05-11 | Nec Laboratories America, Inc. | Throughput maximization using quantized rate control in multiple antenna communication |
FI20050714A0 (fi) * | 2005-07-04 | 2005-07-04 | Nokia Corp | Allokointimenetelmä, verkkoelementti, moduuli ja käyttäjälaite |
US7904117B2 (en) * | 2005-08-12 | 2011-03-08 | Sibeam | Wireless communication device using adaptive beamforming |
US8073395B2 (en) * | 2006-03-07 | 2011-12-06 | Samsung Electronics Co., Ltd. | Channel sensing based on self-signal suppression |
KR101231357B1 (ko) * | 2006-04-06 | 2013-02-07 | 엘지전자 주식회사 | 다중 안테나 시스템에서 채널 상태 정보 귀환 방법 및데이터 송신 방법 |
KR101154992B1 (ko) * | 2006-04-24 | 2012-06-14 | 엘지전자 주식회사 | 다중 사용자 시스템에 적용되는 신호 수신 방법 |
KR101274871B1 (ko) * | 2006-06-14 | 2013-06-17 | 삼성전자주식회사 | 폐 루프 방식의 다중 안테나 시스템에서의 데이터송/수신장치 및 방법 |
US8514728B2 (en) * | 2006-06-22 | 2013-08-20 | Broadcom Corporation | Methods and systems for estimating temporal correlation of a propagation channel |
KR100992418B1 (ko) * | 2006-07-12 | 2010-11-05 | 삼성전자주식회사 | 다중 안테나 시스템의 송신단에서 간섭을 제거하기 위한장치 및 방법 |
KR100951822B1 (ko) | 2007-03-14 | 2010-04-12 | 삼성전자주식회사 | 다중 안테나 무선통신 시스템에서 하향링크 스케줄링 장치및 방법 |
US20090080560A1 (en) * | 2007-09-20 | 2009-03-26 | Cisco Technology, Inc. | Closed-loop beamforming weight estimation in frequency division duplex systems |
EP2192698A1 (en) * | 2008-11-28 | 2010-06-02 | Alcatel Lucent | Selection of Precoding Vectors for Radio Base Station with multiple antennas |
KR101022120B1 (ko) * | 2008-12-23 | 2011-03-17 | 주식회사 세아네트웍스 | 빔포밍을 위한 가중치 행렬 결정 방법 및 장치 |
KR101589607B1 (ko) * | 2009-03-02 | 2016-01-29 | 삼성전자주식회사 | 펨토 기지국과 통신 단말기를 갖는 통신 시스템 및 그의 통신 방법 |
GB2503418A (en) * | 2012-04-27 | 2014-01-01 | Imp Innovations Ltd | Spreading data symbols using a number of signature sequences selected in accordance with system values indicative of signal-to-noise ratios |
Citations (38)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5991273A (en) * | 1997-05-01 | 1999-11-23 | Nortel Networks Corporation | Determining SINR in a communications system |
US6101399A (en) * | 1995-02-22 | 2000-08-08 | The Board Of Trustees Of The Leland Stanford Jr. University | Adaptive beam forming for transmitter operation in a wireless communication system |
WO2001003330A1 (en) | 1999-07-02 | 2001-01-11 | Shattil Steve J | Method and apparatus for using frequency diversity to separate wireless communication signals |
US6177906B1 (en) * | 1999-04-01 | 2001-01-23 | Arraycomm, Inc. | Multimode iterative adaptive smart antenna processing method and apparatus |
US6275543B1 (en) * | 1996-10-11 | 2001-08-14 | Arraycomm, Inc. | Method for reference signal generation in the presence of frequency offsets in a communications station with spatial processing |
EP1143636A2 (en) | 2000-04-07 | 2001-10-10 | SAMSUNG ELECTRONICS Co. Ltd. | Wireless communication system withfeedback and method therefor |
US6314147B1 (en) * | 1997-11-04 | 2001-11-06 | The Board Of Trustees Of The Leland Stanford Junior University | Two-stage CCI/ISI reduction with space-time processing in TDMA cellular networks |
US6320898B1 (en) | 1998-11-30 | 2001-11-20 | Nortel Networks Limited | CDMA pseudo-smart antenna selection |
US6347234B1 (en) * | 1997-09-15 | 2002-02-12 | Adaptive Telecom, Inc. | Practical space-time radio method for CDMA communication capacity enhancement |
US6351499B1 (en) | 1999-12-15 | 2002-02-26 | Iospan Wireless, Inc. | Method and wireless systems using multiple antennas and adaptive control for maximizing a communication parameter |
WO2002033850A1 (de) | 2000-10-16 | 2002-04-25 | Siemens Aktiengesellschaft | Strahlformungsverfahren |
US6404803B1 (en) * | 2000-10-24 | 2002-06-11 | Neoreach, Inc. | PN code acquisition with adaptive antenna array and adaptive threshold for CDMA wireless communications |
US6463295B1 (en) * | 1996-10-11 | 2002-10-08 | Arraycomm, Inc. | Power control with signal quality estimation for smart antenna communication systems |
US6751199B1 (en) * | 2000-04-24 | 2004-06-15 | Qualcomm Incorporated | Method and apparatus for a rate control in a high data rate communication system |
US6754473B1 (en) * | 1999-10-09 | 2004-06-22 | Samsung Electronics Co., Ltd. | Apparatus and method for providing closed-loop transmit antenna diversity in a mobile communication system |
US6754475B1 (en) * | 2002-06-28 | 2004-06-22 | Motorola, Inc. | Transmission performance measurement and use thereof |
US6763011B1 (en) * | 1999-10-08 | 2004-07-13 | Nokia Mobile Phones, Ltd. | Method and arrangement for timing the diversity weight changes in a cellular radio system |
US6766144B2 (en) * | 2000-04-10 | 2004-07-20 | Samsung Electronics Co., Ltd. | Method and apparatus for estimating optimum weight of closed loop transmit deversity for mobile communication |
US6771219B2 (en) * | 2001-12-18 | 2004-08-03 | Lg Electronics Inc. | Adaptive beamforming method for smart antenna system |
US6892059B1 (en) * | 1999-08-24 | 2005-05-10 | Samsung Electronics Co, Ltd. | Closed-loop transmitting antenna diversity method, base station apparatus and mobile station apparatus therefor, in a next generation mobile telecommunications system |
US6985466B1 (en) * | 1999-11-09 | 2006-01-10 | Arraycomm, Inc. | Downlink signal processing in CDMA systems utilizing arrays of antennae |
US7035661B1 (en) * | 1996-10-11 | 2006-04-25 | Arraycomm, Llc. | Power control with signal quality estimation for smart antenna communication systems |
US7068977B1 (en) * | 2002-10-11 | 2006-06-27 | Navini Networks, Inc. | Method and system for interference assessment and reduction in a wireless communication system |
US7072409B2 (en) * | 2000-05-23 | 2006-07-04 | Ntt Docomo, Inc. | Space multiplex radio communication method and radio communication apparatus |
US7079514B2 (en) * | 2001-05-17 | 2006-07-18 | Samsung Electronics Co., Ltd. | Mobile communication apparatus with antenna array and mobile communication method thereof |
US7079867B2 (en) * | 2000-03-08 | 2006-07-18 | Samsung Electronics Co., Ltd. | Semi-blind transmit antenna array device using feedback information and method thereof in a mobile communication system |
US7116944B2 (en) * | 2002-02-07 | 2006-10-03 | Lucent Technologies Inc. | Method and apparatus for feedback error detection in a wireless communications systems |
US7116723B2 (en) * | 2000-07-21 | 2006-10-03 | Samsung Electronics Co., Ltd. | Closed loop transmit diversity method and apparatus using complex basis vector sets for antenna selection |
US7130355B1 (en) * | 2001-07-25 | 2006-10-31 | At&T Corp. | Amelioration in inter-carrier interference in OFDM |
US7133461B2 (en) * | 2001-12-14 | 2006-11-07 | Motorola, Inc. | Stream transmission method and device |
US7155177B2 (en) * | 2003-02-10 | 2006-12-26 | Qualcomm Incorporated | Weight prediction for closed-loop mode transmit diversity |
US7180956B1 (en) * | 2000-08-02 | 2007-02-20 | Via Telecom Co., Ltd. | Method and apparatus for applying overlaid perturbation vectors for gradient feedback transmit antenna array adaptation |
US7194006B2 (en) * | 2000-07-18 | 2007-03-20 | Kathrein-Werke Kg | Directed maximum ratio combining methods and systems for high data rate traffic |
US7218666B2 (en) * | 2000-12-29 | 2007-05-15 | Motorola, Inc. | Method and system for transmission and frequency domain equalization for wideband CDMA system |
US7224758B1 (en) * | 2001-03-23 | 2007-05-29 | Via Telecom Co., Ltd. | Multiple transmit antenna weighting techniques |
US7236478B2 (en) * | 2001-07-20 | 2007-06-26 | Huawei Technologies Co., Ltd. | Method and apparatus for down-link feedback multiple antenna transmission in wireless communication system |
US7248638B1 (en) * | 2001-03-23 | 2007-07-24 | Lsi Logic | Transmit antenna multi-mode tracking |
US7263385B2 (en) * | 2002-08-23 | 2007-08-28 | Qualcomm Incorporated | System and method for beamforming with data rate control feedback |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5886988A (en) * | 1996-10-23 | 1999-03-23 | Arraycomm, Inc. | Channel assignment and call admission control for spatial division multiple access communication systems |
US6335954B1 (en) * | 1996-12-27 | 2002-01-01 | Ericsson Inc. | Method and apparatus for joint synchronization of multiple receive channels |
-
2003
- 2003-02-17 KR KR1020030009909A patent/KR100571862B1/ko active IP Right Grant
-
2004
- 2004-02-17 CN CNB2004100052322A patent/CN1297079C/zh not_active Expired - Lifetime
- 2004-02-17 EP EP04250837A patent/EP1447925B1/en not_active Expired - Lifetime
- 2004-02-17 US US10/778,340 patent/US7406337B2/en active Active
- 2004-02-17 DE DE602004003728T patent/DE602004003728T2/de not_active Expired - Lifetime
Patent Citations (41)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6101399A (en) * | 1995-02-22 | 2000-08-08 | The Board Of Trustees Of The Leland Stanford Jr. University | Adaptive beam forming for transmitter operation in a wireless communication system |
US7035661B1 (en) * | 1996-10-11 | 2006-04-25 | Arraycomm, Llc. | Power control with signal quality estimation for smart antenna communication systems |
US6463295B1 (en) * | 1996-10-11 | 2002-10-08 | Arraycomm, Inc. | Power control with signal quality estimation for smart antenna communication systems |
US6275543B1 (en) * | 1996-10-11 | 2001-08-14 | Arraycomm, Inc. | Method for reference signal generation in the presence of frequency offsets in a communications station with spatial processing |
US5991273A (en) * | 1997-05-01 | 1999-11-23 | Nortel Networks Corporation | Determining SINR in a communications system |
US6347234B1 (en) * | 1997-09-15 | 2002-02-12 | Adaptive Telecom, Inc. | Practical space-time radio method for CDMA communication capacity enhancement |
US6314147B1 (en) * | 1997-11-04 | 2001-11-06 | The Board Of Trustees Of The Leland Stanford Junior University | Two-stage CCI/ISI reduction with space-time processing in TDMA cellular networks |
US6320898B1 (en) | 1998-11-30 | 2001-11-20 | Nortel Networks Limited | CDMA pseudo-smart antenna selection |
US6177906B1 (en) * | 1999-04-01 | 2001-01-23 | Arraycomm, Inc. | Multimode iterative adaptive smart antenna processing method and apparatus |
WO2001003330A1 (en) | 1999-07-02 | 2001-01-11 | Shattil Steve J | Method and apparatus for using frequency diversity to separate wireless communication signals |
US6892059B1 (en) * | 1999-08-24 | 2005-05-10 | Samsung Electronics Co, Ltd. | Closed-loop transmitting antenna diversity method, base station apparatus and mobile station apparatus therefor, in a next generation mobile telecommunications system |
US6763011B1 (en) * | 1999-10-08 | 2004-07-13 | Nokia Mobile Phones, Ltd. | Method and arrangement for timing the diversity weight changes in a cellular radio system |
US6754473B1 (en) * | 1999-10-09 | 2004-06-22 | Samsung Electronics Co., Ltd. | Apparatus and method for providing closed-loop transmit antenna diversity in a mobile communication system |
US6985466B1 (en) * | 1999-11-09 | 2006-01-10 | Arraycomm, Inc. | Downlink signal processing in CDMA systems utilizing arrays of antennae |
US6351499B1 (en) | 1999-12-15 | 2002-02-26 | Iospan Wireless, Inc. | Method and wireless systems using multiple antennas and adaptive control for maximizing a communication parameter |
US7079867B2 (en) * | 2000-03-08 | 2006-07-18 | Samsung Electronics Co., Ltd. | Semi-blind transmit antenna array device using feedback information and method thereof in a mobile communication system |
US6898250B2 (en) * | 2000-04-07 | 2005-05-24 | Samsung Electronics Co., Ltd. | Wireless Communication system with feedback and method therefor |
EP1143636A2 (en) | 2000-04-07 | 2001-10-10 | SAMSUNG ELECTRONICS Co. Ltd. | Wireless communication system withfeedback and method therefor |
US6766144B2 (en) * | 2000-04-10 | 2004-07-20 | Samsung Electronics Co., Ltd. | Method and apparatus for estimating optimum weight of closed loop transmit deversity for mobile communication |
US6751199B1 (en) * | 2000-04-24 | 2004-06-15 | Qualcomm Incorporated | Method and apparatus for a rate control in a high data rate communication system |
US7072409B2 (en) * | 2000-05-23 | 2006-07-04 | Ntt Docomo, Inc. | Space multiplex radio communication method and radio communication apparatus |
US7194006B2 (en) * | 2000-07-18 | 2007-03-20 | Kathrein-Werke Kg | Directed maximum ratio combining methods and systems for high data rate traffic |
US7116723B2 (en) * | 2000-07-21 | 2006-10-03 | Samsung Electronics Co., Ltd. | Closed loop transmit diversity method and apparatus using complex basis vector sets for antenna selection |
US7180956B1 (en) * | 2000-08-02 | 2007-02-20 | Via Telecom Co., Ltd. | Method and apparatus for applying overlaid perturbation vectors for gradient feedback transmit antenna array adaptation |
WO2002033850A1 (de) | 2000-10-16 | 2002-04-25 | Siemens Aktiengesellschaft | Strahlformungsverfahren |
US7158793B2 (en) * | 2000-10-16 | 2007-01-02 | Siemens Aktiengesellschaft | Beam-shaping method |
US20040014434A1 (en) | 2000-10-16 | 2004-01-22 | Martin Haardt | Beam-shaping method |
US6404803B1 (en) * | 2000-10-24 | 2002-06-11 | Neoreach, Inc. | PN code acquisition with adaptive antenna array and adaptive threshold for CDMA wireless communications |
US7218666B2 (en) * | 2000-12-29 | 2007-05-15 | Motorola, Inc. | Method and system for transmission and frequency domain equalization for wideband CDMA system |
US7224758B1 (en) * | 2001-03-23 | 2007-05-29 | Via Telecom Co., Ltd. | Multiple transmit antenna weighting techniques |
US7248638B1 (en) * | 2001-03-23 | 2007-07-24 | Lsi Logic | Transmit antenna multi-mode tracking |
US7079514B2 (en) * | 2001-05-17 | 2006-07-18 | Samsung Electronics Co., Ltd. | Mobile communication apparatus with antenna array and mobile communication method thereof |
US7236478B2 (en) * | 2001-07-20 | 2007-06-26 | Huawei Technologies Co., Ltd. | Method and apparatus for down-link feedback multiple antenna transmission in wireless communication system |
US7130355B1 (en) * | 2001-07-25 | 2006-10-31 | At&T Corp. | Amelioration in inter-carrier interference in OFDM |
US7133461B2 (en) * | 2001-12-14 | 2006-11-07 | Motorola, Inc. | Stream transmission method and device |
US6771219B2 (en) * | 2001-12-18 | 2004-08-03 | Lg Electronics Inc. | Adaptive beamforming method for smart antenna system |
US7116944B2 (en) * | 2002-02-07 | 2006-10-03 | Lucent Technologies Inc. | Method and apparatus for feedback error detection in a wireless communications systems |
US6754475B1 (en) * | 2002-06-28 | 2004-06-22 | Motorola, Inc. | Transmission performance measurement and use thereof |
US7263385B2 (en) * | 2002-08-23 | 2007-08-28 | Qualcomm Incorporated | System and method for beamforming with data rate control feedback |
US7068977B1 (en) * | 2002-10-11 | 2006-06-27 | Navini Networks, Inc. | Method and system for interference assessment and reduction in a wireless communication system |
US7155177B2 (en) * | 2003-02-10 | 2006-12-26 | Qualcomm Incorporated | Weight prediction for closed-loop mode transmit diversity |
Non-Patent Citations (2)
Title |
---|
*Versions furnished: v.5.0.0(Mar. 2002) and v.1.0.0(Dec. 2001). |
3GPP TR25.858* [Internet site: http;//www.3gpp.org/ftp/specs/html%Dinfo/25858.htm]. |
Cited By (232)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8208488B2 (en) | 2002-09-13 | 2012-06-26 | Panasonic Corporation | Radio transmission apparatus and radio transmission method |
US7567583B2 (en) * | 2002-09-13 | 2009-07-28 | Panasonic Corporation | Radio transmission device and radio transmission method |
US9197308B2 (en) | 2002-09-13 | 2015-11-24 | Panasonic Intellectual Property Corporation Of America | Radio transmission apparatus and radio transmission method |
US9008115B2 (en) | 2002-09-13 | 2015-04-14 | Panasonic Intellectual Property Corporation Of America | Integrated circuit for controlling radio transmission and reception |
US20050117520A1 (en) * | 2002-09-13 | 2005-06-02 | Kenichi Miyoshi | Radio transmission device and radio transmission method |
US8750325B2 (en) | 2002-09-13 | 2014-06-10 | Panasonic Corporation | Radio transmission apparatus and radio transmission method |
US11750256B2 (en) * | 2002-11-04 | 2023-09-05 | Xr Communications Llc | Directed wireless communication |
US20070281624A1 (en) * | 2004-11-04 | 2007-12-06 | Motorola, Inc. | Method and apparatus for channel feedback |
US20080273618A1 (en) * | 2004-11-16 | 2008-11-06 | Antonio Forenza | Precoding System and Method for Multi-User Transmission in Multiple Antenna Wireless Systems |
US8130862B2 (en) * | 2004-11-16 | 2012-03-06 | Intellectual Ventures Holding 40 Llc | Precoding system and method for multi-user transmission in multiple antenna wireless systems |
US20100220608A1 (en) * | 2006-03-24 | 2010-09-02 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and arrangement in a telecommunication system |
US8134932B2 (en) * | 2006-03-24 | 2012-03-13 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and arrangement in a telecommunication system |
US20100130151A1 (en) * | 2006-11-14 | 2010-05-27 | Yozo Shoji | Channel characteristic analyzing apparatus and method |
US8306496B2 (en) * | 2006-11-14 | 2012-11-06 | National Institute Of Information And Communications Technology | Channel characteristic analyzing apparatus and method |
US8190207B2 (en) | 2008-04-22 | 2012-05-29 | Motorola Mobility, Inc. | Communication system and method of operation therefor |
US20090262676A1 (en) * | 2008-04-22 | 2009-10-22 | Motorola, Inc. | Communication system and method of operation therefor |
US8040969B2 (en) * | 2008-10-07 | 2011-10-18 | Motorola Mobility, Inc. | Communication system and method of operation therefor |
US20100086072A1 (en) * | 2008-10-07 | 2010-04-08 | Motorola, Inc. | Communication system and method of operation therefor |
US8335167B1 (en) * | 2009-02-02 | 2012-12-18 | Marvell International Ltd. | Refining beamforming techniques for phased-array antennas |
US8644184B1 (en) | 2009-02-02 | 2014-02-04 | Marvell International Ltd. | Beamforming training techniques for MIMO systems |
US9100074B1 (en) | 2009-02-02 | 2015-08-04 | Marvell International Ltd. | Beamforming training techniques for MIMO systems |
US8953642B2 (en) | 2009-09-15 | 2015-02-10 | Lg Electronics Inc. | Method and apparatus for transmitting a downlink reference signal in a wireless communication system supporting multiple antennas |
US8369793B2 (en) * | 2009-10-02 | 2013-02-05 | Telefonaktiebolaget L M Ericsson (Publ) | Channel-dependent scheduling and link adaptation |
US20110081871A1 (en) * | 2009-10-02 | 2011-04-07 | Karl Molnar | Channel-dependent scheduling and link adaptation |
US20140153418A1 (en) * | 2012-12-04 | 2014-06-05 | At&T Intellectual Property I, L.P. | Diagnosis of cellular network element states using radio frequency measurements |
US9532252B2 (en) * | 2012-12-04 | 2016-12-27 | At&T Intellectual Property I, L.P. | Diagnosis of cellular network element states using radio frequency measurements |
US9788326B2 (en) | 2012-12-05 | 2017-10-10 | At&T Intellectual Property I, L.P. | Backhaul link for distributed antenna system |
US9699785B2 (en) | 2012-12-05 | 2017-07-04 | At&T Intellectual Property I, L.P. | Backhaul link for distributed antenna system |
US10194437B2 (en) | 2012-12-05 | 2019-01-29 | At&T Intellectual Property I, L.P. | Backhaul link for distributed antenna system |
US10009065B2 (en) | 2012-12-05 | 2018-06-26 | At&T Intellectual Property I, L.P. | Backhaul link for distributed antenna system |
US9999038B2 (en) | 2013-05-31 | 2018-06-12 | At&T Intellectual Property I, L.P. | Remote distributed antenna system |
US10051630B2 (en) | 2013-05-31 | 2018-08-14 | At&T Intellectual Property I, L.P. | Remote distributed antenna system |
US10091787B2 (en) | 2013-05-31 | 2018-10-02 | At&T Intellectual Property I, L.P. | Remote distributed antenna system |
US9930668B2 (en) | 2013-05-31 | 2018-03-27 | At&T Intellectual Property I, L.P. | Remote distributed antenna system |
US9661505B2 (en) | 2013-11-06 | 2017-05-23 | At&T Intellectual Property I, L.P. | Surface-wave communications and methods thereof |
US9674711B2 (en) | 2013-11-06 | 2017-06-06 | At&T Intellectual Property I, L.P. | Surface-wave communications and methods thereof |
US9794003B2 (en) | 2013-12-10 | 2017-10-17 | At&T Intellectual Property I, L.P. | Quasi-optical coupler |
US9876584B2 (en) | 2013-12-10 | 2018-01-23 | At&T Intellectual Property I, L.P. | Quasi-optical coupler |
US9692101B2 (en) | 2014-08-26 | 2017-06-27 | At&T Intellectual Property I, L.P. | Guided wave couplers for coupling electromagnetic waves between a waveguide surface and a surface of a wire |
US10096881B2 (en) | 2014-08-26 | 2018-10-09 | At&T Intellectual Property I, L.P. | Guided wave couplers for coupling electromagnetic waves to an outer surface of a transmission medium |
US9768833B2 (en) | 2014-09-15 | 2017-09-19 | At&T Intellectual Property I, L.P. | Method and apparatus for sensing a condition in a transmission medium of electromagnetic waves |
US9906269B2 (en) | 2014-09-17 | 2018-02-27 | At&T Intellectual Property I, L.P. | Monitoring and mitigating conditions in a communication network |
US10063280B2 (en) | 2014-09-17 | 2018-08-28 | At&T Intellectual Property I, L.P. | Monitoring and mitigating conditions in a communication network |
US9628854B2 (en) | 2014-09-29 | 2017-04-18 | At&T Intellectual Property I, L.P. | Method and apparatus for distributing content in a communication network |
US9973416B2 (en) | 2014-10-02 | 2018-05-15 | At&T Intellectual Property I, L.P. | Method and apparatus that provides fault tolerance in a communication network |
US9998932B2 (en) | 2014-10-02 | 2018-06-12 | At&T Intellectual Property I, L.P. | Method and apparatus that provides fault tolerance in a communication network |
US9615269B2 (en) | 2014-10-02 | 2017-04-04 | At&T Intellectual Property I, L.P. | Method and apparatus that provides fault tolerance in a communication network |
US9685992B2 (en) | 2014-10-03 | 2017-06-20 | At&T Intellectual Property I, L.P. | Circuit panel network and methods thereof |
US9866276B2 (en) | 2014-10-10 | 2018-01-09 | At&T Intellectual Property I, L.P. | Method and apparatus for arranging communication sessions in a communication system |
US9973299B2 (en) | 2014-10-14 | 2018-05-15 | At&T Intellectual Property I, L.P. | Method and apparatus for adjusting a mode of communication in a communication network |
US9847850B2 (en) | 2014-10-14 | 2017-12-19 | At&T Intellectual Property I, L.P. | Method and apparatus for adjusting a mode of communication in a communication network |
US9762289B2 (en) | 2014-10-14 | 2017-09-12 | At&T Intellectual Property I, L.P. | Method and apparatus for transmitting or receiving signals in a transportation system |
US9960808B2 (en) | 2014-10-21 | 2018-05-01 | At&T Intellectual Property I, L.P. | Guided-wave transmission device and methods for use therewith |
US9571209B2 (en) | 2014-10-21 | 2017-02-14 | At&T Intellectual Property I, L.P. | Transmission device with impairment compensation and methods for use therewith |
US9912033B2 (en) | 2014-10-21 | 2018-03-06 | At&T Intellectual Property I, Lp | Guided wave coupler, coupling module and methods for use therewith |
US9705610B2 (en) | 2014-10-21 | 2017-07-11 | At&T Intellectual Property I, L.P. | Transmission device with impairment compensation and methods for use therewith |
US9596001B2 (en) | 2014-10-21 | 2017-03-14 | At&T Intellectual Property I, L.P. | Apparatus for providing communication services and methods thereof |
US9876587B2 (en) | 2014-10-21 | 2018-01-23 | At&T Intellectual Property I, L.P. | Transmission device with impairment compensation and methods for use therewith |
US9520945B2 (en) | 2014-10-21 | 2016-12-13 | At&T Intellectual Property I, L.P. | Apparatus for providing communication services and methods thereof |
US9525210B2 (en) | 2014-10-21 | 2016-12-20 | At&T Intellectual Property I, L.P. | Guided-wave transmission device with non-fundamental mode propagation and methods for use therewith |
US9871558B2 (en) | 2014-10-21 | 2018-01-16 | At&T Intellectual Property I, L.P. | Guided-wave transmission device and methods for use therewith |
US9653770B2 (en) | 2014-10-21 | 2017-05-16 | At&T Intellectual Property I, L.P. | Guided wave coupler, coupling module and methods for use therewith |
US9948355B2 (en) | 2014-10-21 | 2018-04-17 | At&T Intellectual Property I, L.P. | Apparatus for providing communication services and methods thereof |
US9954286B2 (en) | 2014-10-21 | 2018-04-24 | At&T Intellectual Property I, L.P. | Guided-wave transmission device with non-fundamental mode propagation and methods for use therewith |
US9627768B2 (en) | 2014-10-21 | 2017-04-18 | At&T Intellectual Property I, L.P. | Guided-wave transmission device with non-fundamental mode propagation and methods for use therewith |
US9769020B2 (en) | 2014-10-21 | 2017-09-19 | At&T Intellectual Property I, L.P. | Method and apparatus for responding to events affecting communications in a communication network |
US9577307B2 (en) | 2014-10-21 | 2017-02-21 | At&T Intellectual Property I, L.P. | Guided-wave transmission device and methods for use therewith |
US9780834B2 (en) | 2014-10-21 | 2017-10-03 | At&T Intellectual Property I, L.P. | Method and apparatus for transmitting electromagnetic waves |
US9564947B2 (en) | 2014-10-21 | 2017-02-07 | At&T Intellectual Property I, L.P. | Guided-wave transmission device with diversity and methods for use therewith |
US9577306B2 (en) | 2014-10-21 | 2017-02-21 | At&T Intellectual Property I, L.P. | Guided-wave transmission device and methods for use therewith |
US9544006B2 (en) | 2014-11-20 | 2017-01-10 | At&T Intellectual Property I, L.P. | Transmission device with mode division multiplexing and methods for use therewith |
US9954287B2 (en) | 2014-11-20 | 2018-04-24 | At&T Intellectual Property I, L.P. | Apparatus for converting wireless signals and electromagnetic waves and methods thereof |
US10243784B2 (en) | 2014-11-20 | 2019-03-26 | At&T Intellectual Property I, L.P. | System for generating topology information and methods thereof |
US9800327B2 (en) | 2014-11-20 | 2017-10-24 | At&T Intellectual Property I, L.P. | Apparatus for controlling operations of a communication device and methods thereof |
US9712350B2 (en) | 2014-11-20 | 2017-07-18 | At&T Intellectual Property I, L.P. | Transmission device with channel equalization and control and methods for use therewith |
US9680670B2 (en) | 2014-11-20 | 2017-06-13 | At&T Intellectual Property I, L.P. | Transmission device with channel equalization and control and methods for use therewith |
US9749083B2 (en) | 2014-11-20 | 2017-08-29 | At&T Intellectual Property I, L.P. | Transmission device with mode division multiplexing and methods for use therewith |
US9742521B2 (en) | 2014-11-20 | 2017-08-22 | At&T Intellectual Property I, L.P. | Transmission device with mode division multiplexing and methods for use therewith |
US9531427B2 (en) | 2014-11-20 | 2016-12-27 | At&T Intellectual Property I, L.P. | Transmission device with mode division multiplexing and methods for use therewith |
US9654173B2 (en) | 2014-11-20 | 2017-05-16 | At&T Intellectual Property I, L.P. | Apparatus for powering a communication device and methods thereof |
US10009067B2 (en) | 2014-12-04 | 2018-06-26 | At&T Intellectual Property I, L.P. | Method and apparatus for configuring a communication interface |
US9742462B2 (en) | 2014-12-04 | 2017-08-22 | At&T Intellectual Property I, L.P. | Transmission medium and communication interfaces and methods for use therewith |
US10144036B2 (en) | 2015-01-30 | 2018-12-04 | At&T Intellectual Property I, L.P. | Method and apparatus for mitigating interference affecting a propagation of electromagnetic waves guided by a transmission medium |
US9876570B2 (en) | 2015-02-20 | 2018-01-23 | At&T Intellectual Property I, Lp | Guided-wave transmission device with non-fundamental mode propagation and methods for use therewith |
US9876571B2 (en) | 2015-02-20 | 2018-01-23 | At&T Intellectual Property I, Lp | Guided-wave transmission device with non-fundamental mode propagation and methods for use therewith |
US9749013B2 (en) | 2015-03-17 | 2017-08-29 | At&T Intellectual Property I, L.P. | Method and apparatus for reducing attenuation of electromagnetic waves guided by a transmission medium |
US9793955B2 (en) | 2015-04-24 | 2017-10-17 | At&T Intellectual Property I, Lp | Passive electrical coupling device and methods for use therewith |
US9705561B2 (en) | 2015-04-24 | 2017-07-11 | At&T Intellectual Property I, L.P. | Directional coupling device and methods for use therewith |
US10224981B2 (en) | 2015-04-24 | 2019-03-05 | At&T Intellectual Property I, Lp | Passive electrical coupling device and methods for use therewith |
US9831912B2 (en) | 2015-04-24 | 2017-11-28 | At&T Intellectual Property I, Lp | Directional coupling device and methods for use therewith |
US9948354B2 (en) | 2015-04-28 | 2018-04-17 | At&T Intellectual Property I, L.P. | Magnetic coupling device with reflective plate and methods for use therewith |
US9793954B2 (en) | 2015-04-28 | 2017-10-17 | At&T Intellectual Property I, L.P. | Magnetic coupling device and methods for use therewith |
US9748626B2 (en) | 2015-05-14 | 2017-08-29 | At&T Intellectual Property I, L.P. | Plurality of cables having different cross-sectional shapes which are bundled together to form a transmission medium |
US9871282B2 (en) | 2015-05-14 | 2018-01-16 | At&T Intellectual Property I, L.P. | At least one transmission medium having a dielectric surface that is covered at least in part by a second dielectric |
US9887447B2 (en) | 2015-05-14 | 2018-02-06 | At&T Intellectual Property I, L.P. | Transmission medium having multiple cores and methods for use therewith |
US10679767B2 (en) | 2015-05-15 | 2020-06-09 | At&T Intellectual Property I, L.P. | Transmission medium having a conductive material and methods for use therewith |
US10650940B2 (en) | 2015-05-15 | 2020-05-12 | At&T Intellectual Property I, L.P. | Transmission medium having a conductive material and methods for use therewith |
US9917341B2 (en) | 2015-05-27 | 2018-03-13 | At&T Intellectual Property I, L.P. | Apparatus and method for launching electromagnetic waves and for modifying radial dimensions of the propagating electromagnetic waves |
US9935703B2 (en) | 2015-06-03 | 2018-04-03 | At&T Intellectual Property I, L.P. | Host node device and methods for use therewith |
US10050697B2 (en) | 2015-06-03 | 2018-08-14 | At&T Intellectual Property I, L.P. | Host node device and methods for use therewith |
US10348391B2 (en) | 2015-06-03 | 2019-07-09 | At&T Intellectual Property I, L.P. | Client node device with frequency conversion and methods for use therewith |
US9866309B2 (en) | 2015-06-03 | 2018-01-09 | At&T Intellectual Property I, Lp | Host node device and methods for use therewith |
US10103801B2 (en) | 2015-06-03 | 2018-10-16 | At&T Intellectual Property I, L.P. | Host node device and methods for use therewith |
US10812174B2 (en) | 2015-06-03 | 2020-10-20 | At&T Intellectual Property I, L.P. | Client node device and methods for use therewith |
US9912382B2 (en) | 2015-06-03 | 2018-03-06 | At&T Intellectual Property I, Lp | Network termination and methods for use therewith |
US10797781B2 (en) | 2015-06-03 | 2020-10-06 | At&T Intellectual Property I, L.P. | Client node device and methods for use therewith |
US9912381B2 (en) | 2015-06-03 | 2018-03-06 | At&T Intellectual Property I, Lp | Network termination and methods for use therewith |
US10396887B2 (en) | 2015-06-03 | 2019-08-27 | At&T Intellectual Property I, L.P. | Client node device and methods for use therewith |
US10154493B2 (en) | 2015-06-03 | 2018-12-11 | At&T Intellectual Property I, L.P. | Network termination and methods for use therewith |
US9967002B2 (en) | 2015-06-03 | 2018-05-08 | At&T Intellectual I, Lp | Network termination and methods for use therewith |
US9913139B2 (en) | 2015-06-09 | 2018-03-06 | At&T Intellectual Property I, L.P. | Signal fingerprinting for authentication of communicating devices |
US9997819B2 (en) | 2015-06-09 | 2018-06-12 | At&T Intellectual Property I, L.P. | Transmission medium and method for facilitating propagation of electromagnetic waves via a core |
US9608692B2 (en) | 2015-06-11 | 2017-03-28 | At&T Intellectual Property I, L.P. | Repeater and methods for use therewith |
US10142010B2 (en) | 2015-06-11 | 2018-11-27 | At&T Intellectual Property I, L.P. | Repeater and methods for use therewith |
US10027398B2 (en) | 2015-06-11 | 2018-07-17 | At&T Intellectual Property I, Lp | Repeater and methods for use therewith |
US10142086B2 (en) | 2015-06-11 | 2018-11-27 | At&T Intellectual Property I, L.P. | Repeater and methods for use therewith |
US9820146B2 (en) | 2015-06-12 | 2017-11-14 | At&T Intellectual Property I, L.P. | Method and apparatus for authentication and identity management of communicating devices |
US9667317B2 (en) | 2015-06-15 | 2017-05-30 | At&T Intellectual Property I, L.P. | Method and apparatus for providing security using network traffic adjustments |
US10090601B2 (en) | 2015-06-25 | 2018-10-02 | At&T Intellectual Property I, L.P. | Waveguide system and methods for inducing a non-fundamental wave mode on a transmission medium |
US9787412B2 (en) | 2015-06-25 | 2017-10-10 | At&T Intellectual Property I, L.P. | Methods and apparatus for inducing a fundamental wave mode on a transmission medium |
US9865911B2 (en) | 2015-06-25 | 2018-01-09 | At&T Intellectual Property I, L.P. | Waveguide system for slot radiating first electromagnetic waves that are combined into a non-fundamental wave mode second electromagnetic wave on a transmission medium |
US10069185B2 (en) | 2015-06-25 | 2018-09-04 | At&T Intellectual Property I, L.P. | Methods and apparatus for inducing a non-fundamental wave mode on a transmission medium |
US9882657B2 (en) | 2015-06-25 | 2018-01-30 | At&T Intellectual Property I, L.P. | Methods and apparatus for inducing a fundamental wave mode on a transmission medium |
US9640850B2 (en) | 2015-06-25 | 2017-05-02 | At&T Intellectual Property I, L.P. | Methods and apparatus for inducing a non-fundamental wave mode on a transmission medium |
US10320586B2 (en) | 2015-07-14 | 2019-06-11 | At&T Intellectual Property I, L.P. | Apparatus and methods for generating non-interfering electromagnetic waves on an insulated transmission medium |
US9853342B2 (en) | 2015-07-14 | 2017-12-26 | At&T Intellectual Property I, L.P. | Dielectric transmission medium connector and methods for use therewith |
US9836957B2 (en) | 2015-07-14 | 2017-12-05 | At&T Intellectual Property I, L.P. | Method and apparatus for communicating with premises equipment |
US9882257B2 (en) | 2015-07-14 | 2018-01-30 | At&T Intellectual Property I, L.P. | Method and apparatus for launching a wave mode that mitigates interference |
US10033107B2 (en) | 2015-07-14 | 2018-07-24 | At&T Intellectual Property I, L.P. | Method and apparatus for coupling an antenna to a device |
US10044409B2 (en) | 2015-07-14 | 2018-08-07 | At&T Intellectual Property I, L.P. | Transmission medium and methods for use therewith |
US9847566B2 (en) | 2015-07-14 | 2017-12-19 | At&T Intellectual Property I, L.P. | Method and apparatus for adjusting a field of a signal to mitigate interference |
US9929755B2 (en) | 2015-07-14 | 2018-03-27 | At&T Intellectual Property I, L.P. | Method and apparatus for coupling an antenna to a device |
US10341142B2 (en) | 2015-07-14 | 2019-07-02 | At&T Intellectual Property I, L.P. | Apparatus and methods for generating non-interfering electromagnetic waves on an uninsulated conductor |
US10033108B2 (en) | 2015-07-14 | 2018-07-24 | At&T Intellectual Property I, L.P. | Apparatus and methods for generating an electromagnetic wave having a wave mode that mitigates interference |
US9628116B2 (en) | 2015-07-14 | 2017-04-18 | At&T Intellectual Property I, L.P. | Apparatus and methods for transmitting wireless signals |
US9947982B2 (en) | 2015-07-14 | 2018-04-17 | At&T Intellectual Property I, Lp | Dielectric transmission medium connector and methods for use therewith |
US10205655B2 (en) | 2015-07-14 | 2019-02-12 | At&T Intellectual Property I, L.P. | Apparatus and methods for communicating utilizing an antenna array and multiple communication paths |
US10148016B2 (en) | 2015-07-14 | 2018-12-04 | At&T Intellectual Property I, L.P. | Apparatus and methods for communicating utilizing an antenna array |
US10170840B2 (en) | 2015-07-14 | 2019-01-01 | At&T Intellectual Property I, L.P. | Apparatus and methods for sending or receiving electromagnetic signals |
US9722318B2 (en) | 2015-07-14 | 2017-08-01 | At&T Intellectual Property I, L.P. | Method and apparatus for coupling an antenna to a device |
US9608740B2 (en) | 2015-07-15 | 2017-03-28 | At&T Intellectual Property I, L.P. | Method and apparatus for launching a wave mode that mitigates interference |
US9793951B2 (en) | 2015-07-15 | 2017-10-17 | At&T Intellectual Property I, L.P. | Method and apparatus for launching a wave mode that mitigates interference |
US10090606B2 (en) | 2015-07-15 | 2018-10-02 | At&T Intellectual Property I, L.P. | Antenna system with dielectric array and methods for use therewith |
US9806818B2 (en) | 2015-07-23 | 2017-10-31 | At&T Intellectual Property I, Lp | Node device, repeater and methods for use therewith |
US9871283B2 (en) | 2015-07-23 | 2018-01-16 | At&T Intellectual Property I, Lp | Transmission medium having a dielectric core comprised of plural members connected by a ball and socket configuration |
US9948333B2 (en) | 2015-07-23 | 2018-04-17 | At&T Intellectual Property I, L.P. | Method and apparatus for wireless communications to mitigate interference |
US9749053B2 (en) | 2015-07-23 | 2017-08-29 | At&T Intellectual Property I, L.P. | Node device, repeater and methods for use therewith |
US9912027B2 (en) | 2015-07-23 | 2018-03-06 | At&T Intellectual Property I, L.P. | Method and apparatus for exchanging communication signals |
US10784670B2 (en) | 2015-07-23 | 2020-09-22 | At&T Intellectual Property I, L.P. | Antenna support for aligning an antenna |
US10074886B2 (en) | 2015-07-23 | 2018-09-11 | At&T Intellectual Property I, L.P. | Dielectric transmission medium comprising a plurality of rigid dielectric members coupled together in a ball and socket configuration |
US10020587B2 (en) | 2015-07-31 | 2018-07-10 | At&T Intellectual Property I, L.P. | Radial antenna and methods for use therewith |
US9967173B2 (en) | 2015-07-31 | 2018-05-08 | At&T Intellectual Property I, L.P. | Method and apparatus for authentication and identity management of communicating devices |
US9735833B2 (en) | 2015-07-31 | 2017-08-15 | At&T Intellectual Property I, L.P. | Method and apparatus for communications management in a neighborhood network |
US9838078B2 (en) | 2015-07-31 | 2017-12-05 | At&T Intellectual Property I, L.P. | Method and apparatus for exchanging communication signals |
US9904535B2 (en) | 2015-09-14 | 2018-02-27 | At&T Intellectual Property I, L.P. | Method and apparatus for distributing software |
US10349418B2 (en) | 2015-09-16 | 2019-07-09 | At&T Intellectual Property I, L.P. | Method and apparatus for managing utilization of wireless resources via use of a reference signal to reduce distortion |
US10079661B2 (en) | 2015-09-16 | 2018-09-18 | At&T Intellectual Property I, L.P. | Method and apparatus for use with a radio distributed antenna system having a clock reference |
US10225842B2 (en) | 2015-09-16 | 2019-03-05 | At&T Intellectual Property I, L.P. | Method, device and storage medium for communications using a modulated signal and a reference signal |
US10009063B2 (en) | 2015-09-16 | 2018-06-26 | At&T Intellectual Property I, L.P. | Method and apparatus for use with a radio distributed antenna system having an out-of-band reference signal |
US10136434B2 (en) | 2015-09-16 | 2018-11-20 | At&T Intellectual Property I, L.P. | Method and apparatus for use with a radio distributed antenna system having an ultra-wideband control channel |
US10009901B2 (en) | 2015-09-16 | 2018-06-26 | At&T Intellectual Property I, L.P. | Method, apparatus, and computer-readable storage medium for managing utilization of wireless resources between base stations |
US9705571B2 (en) | 2015-09-16 | 2017-07-11 | At&T Intellectual Property I, L.P. | Method and apparatus for use with a radio distributed antenna system |
US10051629B2 (en) | 2015-09-16 | 2018-08-14 | At&T Intellectual Property I, L.P. | Method and apparatus for use with a radio distributed antenna system having an in-band reference signal |
US9769128B2 (en) | 2015-09-28 | 2017-09-19 | At&T Intellectual Property I, L.P. | Method and apparatus for encryption of communications over a network |
US9729197B2 (en) | 2015-10-01 | 2017-08-08 | At&T Intellectual Property I, L.P. | Method and apparatus for communicating network management traffic over a network |
US10074890B2 (en) | 2015-10-02 | 2018-09-11 | At&T Intellectual Property I, L.P. | Communication device and antenna with integrated light assembly |
US9876264B2 (en) | 2015-10-02 | 2018-01-23 | At&T Intellectual Property I, Lp | Communication system, guided wave switch and methods for use therewith |
US9882277B2 (en) | 2015-10-02 | 2018-01-30 | At&T Intellectual Property I, Lp | Communication device and antenna assembly with actuated gimbal mount |
US10051483B2 (en) | 2015-10-16 | 2018-08-14 | At&T Intellectual Property I, L.P. | Method and apparatus for directing wireless signals |
US10665942B2 (en) | 2015-10-16 | 2020-05-26 | At&T Intellectual Property I, L.P. | Method and apparatus for adjusting wireless communications |
US10355367B2 (en) | 2015-10-16 | 2019-07-16 | At&T Intellectual Property I, L.P. | Antenna structure for exchanging wireless signals |
US9912419B1 (en) | 2016-08-24 | 2018-03-06 | At&T Intellectual Property I, L.P. | Method and apparatus for managing a fault in a distributed antenna system |
US9860075B1 (en) | 2016-08-26 | 2018-01-02 | At&T Intellectual Property I, L.P. | Method and communication node for broadband distribution |
US10291311B2 (en) | 2016-09-09 | 2019-05-14 | At&T Intellectual Property I, L.P. | Method and apparatus for mitigating a fault in a distributed antenna system |
US11032819B2 (en) | 2016-09-15 | 2021-06-08 | At&T Intellectual Property I, L.P. | Method and apparatus for use with a radio distributed antenna system having a control channel reference signal |
US10135146B2 (en) | 2016-10-18 | 2018-11-20 | At&T Intellectual Property I, L.P. | Apparatus and methods for launching guided waves via circuits |
US10135147B2 (en) | 2016-10-18 | 2018-11-20 | At&T Intellectual Property I, L.P. | Apparatus and methods for launching guided waves via an antenna |
US10340600B2 (en) | 2016-10-18 | 2019-07-02 | At&T Intellectual Property I, L.P. | Apparatus and methods for launching guided waves via plural waveguide systems |
US10374316B2 (en) | 2016-10-21 | 2019-08-06 | At&T Intellectual Property I, L.P. | System and dielectric antenna with non-uniform dielectric |
US9876605B1 (en) | 2016-10-21 | 2018-01-23 | At&T Intellectual Property I, L.P. | Launcher and coupling system to support desired guided wave mode |
US9991580B2 (en) | 2016-10-21 | 2018-06-05 | At&T Intellectual Property I, L.P. | Launcher and coupling system for guided wave mode cancellation |
US10811767B2 (en) | 2016-10-21 | 2020-10-20 | At&T Intellectual Property I, L.P. | System and dielectric antenna with convex dielectric radome |
US10340573B2 (en) | 2016-10-26 | 2019-07-02 | At&T Intellectual Property I, L.P. | Launcher with cylindrical coupling device and methods for use therewith |
US10312567B2 (en) | 2016-10-26 | 2019-06-04 | At&T Intellectual Property I, L.P. | Launcher with planar strip antenna and methods for use therewith |
US10291334B2 (en) | 2016-11-03 | 2019-05-14 | At&T Intellectual Property I, L.P. | System for detecting a fault in a communication system |
US10498044B2 (en) | 2016-11-03 | 2019-12-03 | At&T Intellectual Property I, L.P. | Apparatus for configuring a surface of an antenna |
US10225025B2 (en) | 2016-11-03 | 2019-03-05 | At&T Intellectual Property I, L.P. | Method and apparatus for detecting a fault in a communication system |
US10224634B2 (en) | 2016-11-03 | 2019-03-05 | At&T Intellectual Property I, L.P. | Methods and apparatus for adjusting an operational characteristic of an antenna |
US10178445B2 (en) | 2016-11-23 | 2019-01-08 | At&T Intellectual Property I, L.P. | Methods, devices, and systems for load balancing between a plurality of waveguides |
US10535928B2 (en) | 2016-11-23 | 2020-01-14 | At&T Intellectual Property I, L.P. | Antenna system and methods for use therewith |
US10340601B2 (en) | 2016-11-23 | 2019-07-02 | At&T Intellectual Property I, L.P. | Multi-antenna system and methods for use therewith |
US10090594B2 (en) | 2016-11-23 | 2018-10-02 | At&T Intellectual Property I, L.P. | Antenna system having structural configurations for assembly |
US10340603B2 (en) | 2016-11-23 | 2019-07-02 | At&T Intellectual Property I, L.P. | Antenna system having shielded structural configurations for assembly |
US10305190B2 (en) | 2016-12-01 | 2019-05-28 | At&T Intellectual Property I, L.P. | Reflecting dielectric antenna system and methods for use therewith |
US10361489B2 (en) | 2016-12-01 | 2019-07-23 | At&T Intellectual Property I, L.P. | Dielectric dish antenna system and methods for use therewith |
US10755542B2 (en) | 2016-12-06 | 2020-08-25 | At&T Intellectual Property I, L.P. | Method and apparatus for surveillance via guided wave communication |
US10637149B2 (en) | 2016-12-06 | 2020-04-28 | At&T Intellectual Property I, L.P. | Injection molded dielectric antenna and methods for use therewith |
US9927517B1 (en) | 2016-12-06 | 2018-03-27 | At&T Intellectual Property I, L.P. | Apparatus and methods for sensing rainfall |
US10020844B2 (en) | 2016-12-06 | 2018-07-10 | T&T Intellectual Property I, L.P. | Method and apparatus for broadcast communication via guided waves |
US10819035B2 (en) | 2016-12-06 | 2020-10-27 | At&T Intellectual Property I, L.P. | Launcher with helical antenna and methods for use therewith |
US10326494B2 (en) | 2016-12-06 | 2019-06-18 | At&T Intellectual Property I, L.P. | Apparatus for measurement de-embedding and methods for use therewith |
US10694379B2 (en) | 2016-12-06 | 2020-06-23 | At&T Intellectual Property I, L.P. | Waveguide system with device-based authentication and methods for use therewith |
US10135145B2 (en) | 2016-12-06 | 2018-11-20 | At&T Intellectual Property I, L.P. | Apparatus and methods for generating an electromagnetic wave along a transmission medium |
US10382976B2 (en) | 2016-12-06 | 2019-08-13 | At&T Intellectual Property I, L.P. | Method and apparatus for managing wireless communications based on communication paths and network device positions |
US10727599B2 (en) | 2016-12-06 | 2020-07-28 | At&T Intellectual Property I, L.P. | Launcher with slot antenna and methods for use therewith |
US10439675B2 (en) | 2016-12-06 | 2019-10-08 | At&T Intellectual Property I, L.P. | Method and apparatus for repeating guided wave communication signals |
US10547348B2 (en) | 2016-12-07 | 2020-01-28 | At&T Intellectual Property I, L.P. | Method and apparatus for switching transmission mediums in a communication system |
US9893795B1 (en) | 2016-12-07 | 2018-02-13 | At&T Intellectual Property I, Lp | Method and repeater for broadband distribution |
US10389029B2 (en) | 2016-12-07 | 2019-08-20 | At&T Intellectual Property I, L.P. | Multi-feed dielectric antenna system with core selection and methods for use therewith |
US10446936B2 (en) | 2016-12-07 | 2019-10-15 | At&T Intellectual Property I, L.P. | Multi-feed dielectric antenna system and methods for use therewith |
US10027397B2 (en) | 2016-12-07 | 2018-07-17 | At&T Intellectual Property I, L.P. | Distributed antenna system and methods for use therewith |
US10168695B2 (en) | 2016-12-07 | 2019-01-01 | At&T Intellectual Property I, L.P. | Method and apparatus for controlling an unmanned aircraft |
US10359749B2 (en) | 2016-12-07 | 2019-07-23 | At&T Intellectual Property I, L.P. | Method and apparatus for utilities management via guided wave communication |
US10243270B2 (en) | 2016-12-07 | 2019-03-26 | At&T Intellectual Property I, L.P. | Beam adaptive multi-feed dielectric antenna system and methods for use therewith |
US10139820B2 (en) | 2016-12-07 | 2018-11-27 | At&T Intellectual Property I, L.P. | Method and apparatus for deploying equipment of a communication system |
US10326689B2 (en) | 2016-12-08 | 2019-06-18 | At&T Intellectual Property I, L.P. | Method and system for providing alternative communication paths |
US10103422B2 (en) | 2016-12-08 | 2018-10-16 | At&T Intellectual Property I, L.P. | Method and apparatus for mounting network devices |
US10601494B2 (en) | 2016-12-08 | 2020-03-24 | At&T Intellectual Property I, L.P. | Dual-band communication device and method for use therewith |
US10938108B2 (en) | 2016-12-08 | 2021-03-02 | At&T Intellectual Property I, L.P. | Frequency selective multi-feed dielectric antenna system and methods for use therewith |
US10916969B2 (en) | 2016-12-08 | 2021-02-09 | At&T Intellectual Property I, L.P. | Method and apparatus for providing power using an inductive coupling |
US9998870B1 (en) | 2016-12-08 | 2018-06-12 | At&T Intellectual Property I, L.P. | Method and apparatus for proximity sensing |
US10411356B2 (en) | 2016-12-08 | 2019-09-10 | At&T Intellectual Property I, L.P. | Apparatus and methods for selectively targeting communication devices with an antenna array |
US10777873B2 (en) | 2016-12-08 | 2020-09-15 | At&T Intellectual Property I, L.P. | Method and apparatus for mounting network devices |
US9911020B1 (en) | 2016-12-08 | 2018-03-06 | At&T Intellectual Property I, L.P. | Method and apparatus for tracking via a radio frequency identification device |
US10530505B2 (en) | 2016-12-08 | 2020-01-07 | At&T Intellectual Property I, L.P. | Apparatus and methods for launching electromagnetic waves along a transmission medium |
US10389037B2 (en) | 2016-12-08 | 2019-08-20 | At&T Intellectual Property I, L.P. | Apparatus and methods for selecting sections of an antenna array and use therewith |
US10069535B2 (en) | 2016-12-08 | 2018-09-04 | At&T Intellectual Property I, L.P. | Apparatus and methods for launching electromagnetic waves having a certain electric field structure |
US9838896B1 (en) | 2016-12-09 | 2017-12-05 | At&T Intellectual Property I, L.P. | Method and apparatus for assessing network coverage |
US10264586B2 (en) | 2016-12-09 | 2019-04-16 | At&T Mobility Ii Llc | Cloud-based packet controller and methods for use therewith |
US10340983B2 (en) | 2016-12-09 | 2019-07-02 | At&T Intellectual Property I, L.P. | Method and apparatus for surveying remote sites via guided wave communications |
US9973940B1 (en) | 2017-02-27 | 2018-05-15 | At&T Intellectual Property I, L.P. | Apparatus and methods for dynamic impedance matching of a guided wave launcher |
US10298293B2 (en) | 2017-03-13 | 2019-05-21 | At&T Intellectual Property I, L.P. | Apparatus of communication utilizing wireless network devices |
Also Published As
Publication number | Publication date |
---|---|
US20040224725A1 (en) | 2004-11-11 |
DE602004003728D1 (de) | 2007-02-01 |
EP1447925B1 (en) | 2006-12-20 |
EP1447925A3 (en) | 2004-12-15 |
CN1523785A (zh) | 2004-08-25 |
EP1447925A2 (en) | 2004-08-18 |
KR100571862B1 (ko) | 2006-04-17 |
CN1297079C (zh) | 2007-01-24 |
DE602004003728T2 (de) | 2007-10-11 |
KR20040074340A (ko) | 2004-08-25 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US7406337B2 (en) | Wireless communication system and method using multiple antennas | |
KR100640470B1 (ko) | 패킷 서비스 통신 시스템에서 전송 안테나 다이버시티방식을 사용하여 데이터를 전송 장치 및 방법 | |
KR100526542B1 (ko) | 이동 통신 시스템에서 다중안테나를 사용하는송신다이버시티 방식을 사용하여 데이터를 송수신하는장치 및 방법 | |
US7412212B2 (en) | Communication system | |
KR100526499B1 (ko) | 두 개 이상 안테나를 사용하는 안테나 전송 다이버시티방법 및 장치 | |
EP1330050B1 (en) | A method and device for downlink feedback multiple antenna transmit in wireless communication system | |
US7542734B2 (en) | Data transmission scheme in wireless communication system | |
US7499728B2 (en) | System and method for transmitting and receiving a signal in a mobile communication system using a multiple input multiple output adaptive antenna array scheme | |
US20080113626A1 (en) | Mobile communication apparatus and method including base station and mobile station having multi-antenna | |
US8054905B2 (en) | Method of measuring transmit quality in a closed loop diversity communication system | |
US7391831B2 (en) | Apparatus and method for mode transition of a transmit diversity scheme in a mobile communication system for using transmit diversity scheme in a mobile communication system for using transmit | |
US7050776B2 (en) | Mobile communication apparatus including transceiving multi-antennas and mobile communication method | |
US7324480B2 (en) | Mobile communication apparatus and method including base station and mobile station having multi-antenna | |
KR100663442B1 (ko) | 적응 안테나 어레이 방식을 사용하는 이동 통신 시스템에서 신호 수신 장치 및 방법 | |
Berger et al. | Interaction of transmit diversity and proportional fair scheduling | |
Chun | A downlink beamforming in consideration of common pilot and phase mismatch | |
EP1929662B1 (en) | Data transmission scheme in wireless communication system |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SAMSUNG ELELCTRONICS CO., LTD., KOREA, REPUBLIC OF Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KIM, SUNG-JIN;LI, JIANJUN;KIM, HO-JIN;AND OTHERS;REEL/FRAME:015555/0550 Effective date: 20040513 |
|
FEPP | Fee payment procedure |
Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
FEPP | Fee payment procedure |
Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY Free format text: PAYER NUMBER DE-ASSIGNED (ORIGINAL EVENT CODE: RMPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
FPAY | Fee payment |
Year of fee payment: 4 |
|
FPAY | Fee payment |
Year of fee payment: 8 |
|
AS | Assignment |
Owner name: NOKIA SOLUTIONS AND NETWORKS OY, FINLAND Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SAMSUNG ELECTRONICS CO., LTD.;REEL/FRAME:040061/0804 Effective date: 20160712 |
|
MAFP | Maintenance fee payment |
Free format text: PAYMENT OF MAINTENANCE FEE, 12TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1553); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY Year of fee payment: 12 |